May 30, 2020 • 30 mins
It’s likely that without the invention of the pneumatic jackhammer, the Industrial Revolution wouldn’t have hummed along quite so smoothly. Certainly a lot more trains would go around mountains than through them. Learn about this essential tool in this classic episode.
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Episode Transcript
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Speaker 1 (00:00):
Hey, everybody, this is Chuck here on a Saturday. It's beautiful,
it's sunny. It's actually rainy and cold. But maybe by
the time this rolls around it will be beautiful and sunny.
But I know in February six two sixteen, it was
not beautiful and sunny because we released an episode that
has gone down and stuff you should know history as uh,
from our point of view, quite possibly the most boring,
(00:23):
worst one. So I thought I would pick this one
and rerelease it into the world and just see if
it's as bad as I thought it was. This is
our very very infamous episode on Jackhammers. Yes, we did
an entire episode on Jackhammers and here it is right now.
(00:43):
Welcome to Stuff You should Know, a production of My
Heart Radios How Stuff Works. Hey, welcome to the podcast.
I'm Josh Clark. There's Charles w Chuck Bryant, and Jerry's
over there, which means time for Stuff you should know.
The Jackhammer edition coming at you. That's right, the most annoying,
(01:09):
one of the most annoying sounds. And I know you
hate the leaf blower. Yeah, it's established. I think the
camera up there. Sure, yeah, but we don't live in
New York if we lived in New York Jackhammer b
number one. I feel like I've never stayed in a
hotel in New York where there wasn't a jack below me,
not even a chance. Every single time leaf blower. It's
(01:33):
a lot more frequent down here in Atlanta than the jackhammer.
Not a lot of leaf blowers in New York City,
not a lot of leaves. Well, that's not necessarily true.
You've been somewhere you are. Uh So we don't usually
um shout out to thank you at the beginning of
an episode, but we got a couple of gifts that
are so special we want to do that. So Peter
(01:55):
O'Donnell in the gang at built Sharp Knives b I
l T Sharp out of Philly. H sent us, sent
me a chef's knife, sent you a filet knife beat
and it's one of the most gorgeous pieces of like
handmade craftsmanship I've ever seen. It's amazing. I cannot wait
(02:18):
to catch a fish. Oh dude, I can't wait for
that for you cut that thing open, yeah, after it's dead.
Uh really, you can't lock the head off while it's
still alive. They think you're supposed to you're supposed to
hit it with a hammer. I think some people do. Um,
I do not. These things are gorgeous. I mean the
(02:38):
blade itself, I mean the hand make these, the handle,
the weight, it's just it's a piece of art. And
not only that, it is the sharpest thing I've ever
seen in my life. It's like dangerous. Um, but I
don't want to you know, it's dangerous. They're knives. They're
supposed to be sharp, but wield it with respect. Well yeah,
(02:58):
well they're respectable. Live so um that you can actually
go into tumbler. You can just search hashtag knives. You
should know one word and it uh it chronicles and
pictures and short captions or brief captions the process of
them making our knives. It's awesome. Yeah, it's just really
neat and I just love like handcrafting and forging steel,
(03:21):
like those are lost arts in a lot of ways,
and um, they're doing it right man, they're really beautiful.
Cool man. So anyway, thank you, Yeah, thank you guys. Thanks.
It was really cool. So jack hammers, yeah, jack hammers.
If they were sharpest built sharp knives, they'd be onto something.
But I don't know if it would work. Quite the same,
Probably not so. Um, Yes, it's true we are actually
(03:43):
talking about jack hammers, and yes, it's true that jack
hammers are about what you think they are, but they're
also kind of interesting when you start to look into them. Right.
Oh yeah, well yes, so think about I didn't realize this.
This article points it out. Jack hammer is a hammer
and a chisel, but it's a hardcore hammer and chisel. Yeah,
(04:05):
and it takes out of the equation largely the human
who's back and shoulder muscles have to be involved in
every single strike of that hammer and chisel. You're talking
John Henry and the sledge hammer, Yes, exactly, because prior
to the advent of the jackhammer about eight fifties, by
the turn of the last century, we had jackhammers kind
(04:27):
of down pat um. It was sledge hammers and pick
axes to remove rock. It was a real deal that
was like killed people like it literally could kill you
with that kind of work. Yeah. I mean, mining is
still a very dangerous job, but pre Industrial Revolution mining
(04:49):
was no fun um, dangerous, deadly, and even if you
didn't die, it's just brutal, brutal back baking work, baking work, slinging,
as sledgehammer. Yeah, you ever slung a sledge it's the worst.
It's it's hard work. You ever used the jackhammer? No,
I haven't. It's awful. Well, that's the thing. It's better
(05:10):
than the sledgehammer. Yeah, well in some ways. But it's
brutally difficult. It is. It's probably one of the most
brutal tools you can use on any kind of site
and for any kind of project. There aren't that many
tools that there. They're gonna take as much out of
you as the jackhammers on your body. Yeah, because they
weigh about a hundred pounds, like a normal heavy duty
(05:31):
jackhammer weighs about a hundred pounds. You have to hold
it in place upright, because you don't want to jumping around,
although it's probably not going to anyway. It's it's designed
not to jump around, but you still have to. Um.
You want to kind of keep it in a fairly
confined area, which means you're using your muscles to study
it while it's going up and down at a very
(05:51):
very fast rate. Some of those things UM impact with
the ground one thousand to forty times a minute. It's tough.
It's it's the only tool that and the hardwood floor,
um skimmer, you know, like the orbital floor cleaner. You
can use that on like put a standing pad on
(06:12):
a hardwood floor, and that thing. And the sledge hammer.
The only time I've ever used tools that I felt
like we're controlling me and not me, not controlling the
tool until you get it. Once you get it, it's
a little better. But at first, when you first start
to use it. You can rent a jackhammer, you know. Yeah,
I mean, if you want to bust up your driveway,
you can go do it yourself. If you're a fool,
(06:34):
make sure that you don't need the driveway anymore before
you do that. Yeah. Yeah. But um, once you get
the hang of it, you kind of can wield it
a little bit. But it's tough. I mean, it feels
like I have no power or control over this thing, right,
I can imagine you know. So, Um, it is a
very difficult tool. But again, the alternative is early death,
(06:57):
and the other alternative, which is to call someone to
do it for you, is the best option of the three.
But so say that you are um King Carlo Alberto
of Sardinia and the years about eighteen thirty something, eighteen
forty and you want a train tunnel built through a mountain,
(07:18):
and the tunnel is gonna need to be twelve kilometers long.
You do call somebody else, but that somebody else you
call goes. I don't know what to tell you, buddy.
We could try pick axes or whatever, but you're not
still gonna be alive by the time we finished. What
can we do? And actually this call for a twelve
kilometer long tunnel through a mountain in Sardinia prompted the
(07:40):
early um the early forays into developing pneumatic tools like
a jackhammer. Yeah, in eighteen forty eight it got named
Jonathan Couch built a what he called a percussion drill,
and this had a bit that was it went through
the piston of a steam engine, so it was piston driven.
Then uh contemporary Joseph Foul actually attached it to the
(08:03):
piston and then he started in eightf one using air
which is pneumatic to power it. But these were still
attached to a piston. And it wasn't until Charles Brady
King when he actually has given credit for inventing the
traditional looking handheld modern jack modern pneumatic powered jackhammer, right,
(08:28):
and he gets a lot of credit for stuff that
was already built. Like a lot of people say he
was actually the inventor of the automobile. No he wasn't.
Oh well, he was the inventor of the gasoline powered automobile.
No he wasn't. He was the first guy in Detroit
to build and drive one around. Yeah, and he did
end up inspiring and mentoring Ransom Olds and Henry Ford
and some other early car manufacturers and is almost single
(08:50):
handily responsible for making Detroit motor city. This guy, but
he also Stanley right? Uh? And what's from his eights? Freely?
I like that guy's stuff? What do you mean didn't
he get kicked out of Kiss? Oh? I think he
was sort of not invited back. Yeah. I think it's
a money move. They don't have to pay the nameless
(09:12):
other guitar player nearly as well. He was a founder
of the band. Right, How do you get kicked out
like that for money? I think Paul Stanley and Jean
Simmons probably own Kiss Incorporated. I know. Anyway, Um, Charles
Brady King Uh, he put Detroit on the map as
far as auto manufacturer goes. And he did do a
(09:34):
lot of refining of pneumatic tools, including the jack hammer.
And he does hold the pattern, he did hold the
patent for it. Yeah, and he had been a lot
of stuff. He was a sharp guy. And the pneumatic,
the fact that it's pneumatic, which means air powered, compressed
air powered UM is the reason why most jackhammers today
are still compressed air powered. It's because of the mining
(09:59):
application an it. Yeah, like when you mind, you're releasing
a lot of potentially explosive gases and uh, you can't
have something like a steam engine that's combustion powered down there, yeah,
or you can't have an engine in there releasing exhaust. Um.
And you can't have a jackhammer that will spark a rock. Um.
(10:24):
Well that might happen no matter what. Right, Well, no,
that's what I'm saying. You can't have that among volatile gases.
So you've air driven is the perfect key, because it
doesn't matter if that hoses a thousand feet long. You're
not gonna lose power because it's gonna be Yeah, it's
gonna be compressed air up against compressed air, and up
on the surface. You've got a diesel engine that's powering
(10:45):
a piston just like in your car, and the piston
moves up and down the cylinder. As it moves down,
it compresses the air in the cylinder and pushes it
down into a storage tank where it sits a compressed
air and that's released out the other end through the
hose and it ends up into the jackhammer. And yeah,
no matter how far away it is, it's still going
to be just as powerful. And that compressed air is inflammable,
(11:08):
so you can be a happy miner all the live
long day. Well, buddy, you're getting excited, so that means
we need to take a break and put this pill
under your tongue and we'll come back right after this story.
(11:37):
How you feeling now, relaxed? Good? I love the title
of this next section, Air powered destruction. Um, you can
get an electric jackhamer. If you've ever gone to a
hardware store, they have these kind of smaller handheld jack
hammers that, um, you can take up like your bathroom
(11:59):
floor tile pretty well with it plugging into the wall.
Has a little chisel bit on the end of it. Um,
But that's small. Beans. You can't do a driveway or
concrete or asphalt with with something like that, or a
twelve kilometer tunnel through a mountain in Sardinia. No, you
need the big T shaped jack camera. And here's one
(12:19):
of the things that didn't really occur to me. One
of the reasons it works so well is because it's
so heavy. Right. It's not like things say, well, let's
make this thing way fifteen pounds or twenty pounds to
make it easier to run, which they probably could. Yeah,
you maybe could do that, but it would jump all
over the place. Yeah, you want that thing super super
heavy because that's part of the power and forced behind it.
That's right. So these things are pneumatic, right, And just
(12:41):
like on the compressed air compressor up on the surface
when you're done in the mine, they actually have a
jackhammer has a piston in a piston in a cylinder
in it, right, Okay, And it's it's actually a really
kind of simple when you cut the thing open and
draw a cross section of it, which we did, yeah,
(13:03):
on our hands for crib sheets. Um you you you
can see that. Really the whole mechanism comes down to
a trigger valve, right, that's right. So what you have
here is you got the pressure chamber. The compressed air
enters that chamber activates the trigger valve. And it just
because of the compressed air opens and shuts really fast, right,
(13:24):
and so the trigger valve moves the air either above
the piston or when it closes, the air goes down
below the piston, which means chisel goes up, chisel goes down, right,
because the piston is striking the top of that chisel bit,
driving it downward when the compressed air comes in and
pushes the piston down. And then when the valve closes
(13:46):
and the air goes underneath the piston, there's also a
spring in there that brings the drill bit back up.
Because it wouldn't work very well if you knock it down.
They had to go down and reset it. And apparently
the earliest um, the earliest Jackhammeer had that very designed
that feature. That was it like it go bam and
(14:06):
then you definitely like reset it bam and then reset
it and they're like, this isn't gonna work. Yeah, that's
sort of like the pneumatic cattle punch that they that
what's his face used in no Country for old men.
One way, it's exactly like that. Not very good if
you're trying to bust up concrete, but good if you
want to put on a cow. That's right. It doesn't
(14:28):
stunn them. It does the eternal stunt. I think it
stuns a cow and then they kill them. Oh I
thought it they put it into the brain to kill
the cow. I don't think it actually. I think it
can and probably does sometimes, but I think the main
purpose of it is to stun the cow, so it's
not like it's just dazed and out of it when
it when it, they kill it. Oh yeah, yeah. Uh.
(14:51):
Hydraulic jackhammers, it's the same. Uh jackhammer would kill a cow.
Hydraulics use fluid, same principle, but it doesn't use air.
And if you've ever seen the they have jackhammers you
can that are really large that you can't handle as
a person, but it's like attached to a backhoe or
something that's for big, big jobs. And those are usually
(15:13):
um hydraulic and pneumatic. Right, but probably not every time.
I'm sure someone in the construction industry will correct me
on that. Well. I went and looked, and if you
go on Alibaba that you know that's I has everything
and they have hydraulic jack hammers for sale. What's ali
baba is that like Skymall. It's like China's Amazon, but
(15:33):
they sell everything on it. It's nothing like Skymall. Do
you think everything's like skymallers because you want a skymall
to come back? I sure do. Um, but they it
did seem like all of the back hoe attached um
jack hammers were hydraulic that I saw. Okay, all right, well, um,
(15:53):
here's what happens at a thousand hits per minute. That
chisel bit and if you're breaking up rock. They're different
kinds of bits. A pointy bit if you're breaking up
like a driveway or something is really good, or you
can use a flat bit for other applications. So yeah,
if you're breaking up a driveway and all you want
is for the driveway to go bye by, Yeah, the
(16:15):
pointy bits the one you want because it's not a
controlled cut. The the the like a flathead screw driver
style bit is the kind that where you can really
kind of control where the cracking goes right or if
you wanna, uh, like I said, if you're taking up
your floor tile and you have the handheld version, that's
what you want to scoot it underneath the tile and
(16:35):
chip it up and there's actually there's like, um, some
insane mathematicians have actually like tried to figure out how
you can predict how cracks propagate. Yeah, there's like um
for the most efficient jackhammering pretty much like what bit
will work best, and like where to place it and
how to how to use it. But um, one of
(16:56):
the things that I didn't understand before is that when
you are jackhammering, you you are creating different types of
uh uh flaws basically in this solid say, concrete structure, right,
And when you're doing that, the first flaw you're doing,
the first flaw you're creating is this um kind of
(17:18):
surface powder that the the initial chips you're making are
actually powder izing and and congealing around the drill bit, right,
And that powder actually transmits the impact of the jackhammer
throughout the rest of the concrete pad in that immediate area,
and that actually starts to create cracks. So you think, well,
(17:40):
it's just the drill bit creating crack. It gets in
there enough. Actually no, it's it's generating like these different
materials from the very concrete itself, and it's using those
materials to distribute the force and create cracks that ultimately
start to spread and propagate, and as they spread and propagate,
they get bigger and bigger, and then a chip comes off.
(18:01):
And when the chip comes off, the amount of force
that's generated and there goes down again and you have
to build it back up by more jackhammering. But eventually
these larger cracks that you're making come together and then
big chunks break off. And then when a big chunk
breaks off, you want somebody to come in and clear
the chunks away while you move the jackhammer, because you're
just gonna be breaking up those chunks. And that's not
(18:23):
the point of jackhammer anymore. Now. The point is you're
trying to remove whatever material in his bigger pieces as
can be removed, you know, right, like by like a
bacco with a bucket or something. Um. Obviously it can't
be too big because you might have to break up
in a smaller bits. If you don't want a three
million little tiny rocks at the end of it, right,
(18:43):
you're not breaking it into gravel. No, the machines that
do that. Um, some of these things actually when when
you create a crater, that's good, but you don't want
your crater full of junk. So some of them actually
have air water that blast the stuff clear as you're going,
which is pretty neat too, Yeah, which is a it's
(19:05):
a big that's an issue because the stuff that that
dust that accumulates that forms what's called the crushed zone,
that powder that distributes the force um is actually can
be a health hazard. And there's actually a lot of
health hazards with jack hammers. Uh. And we'll talk about
them right after this, all right, Josh, health hazards of
(19:47):
jackhammering um that dust is no joke. Well, before we
go to health hazards, let me say this. What you
and actually can be a health hazard. It can be
dangerous when you get your bits stuck. Uh. And the
general rule of thumb is you don't want to put
the bit farther down. You don't want to keep going
down farther than the length of the bit, because if
(20:09):
you get your bit stuck, then it's really tough to
get back out. Yeah. And while it may give you
a little break, your boss didn't gonna be happy, or
if you're renting that thing by the hour at your house, yeah,
you're not gonna be happy. Yeah, because you just used
all of the force of that compressed air to jam
that that chisel bit several inches into concrete. Yes, it's not.
(20:30):
You need like King Arthur to get that out. Yeah,
so move it around, um inches at a time so
it doesn't go straight down into one spot. And you
want a sharp bit as well. Obviously a dull bit
is gonna get stuck easier and it's not going to
break up the material as well. Um. And like you
said at the beginning that the jackhammers one of the
noisiest tools around, it's the worst. It might be the
(20:53):
noisiest tool. Jack hammers um create a noise at about
hundred and thirty decibels from why this article says, Yeah,
that is the that is the sound of a jet
engine taking off. That's how that's how loud those things
are and driving here, no joke. I passed a dude
(21:14):
using a jack camera, huh. And he wasn't wearing your protection,
you know. I was just about to say, is I
bet you've never seen a jackhammer operator not use your protection?
I never have until today. That's nuts. Isn't that a
weird coincidence? Though? It is totally weird and like just dumb.
He's like screwed, I got health insurance. Uh, construction headphones
(21:36):
are a must. Um. And because we're talking about how
how much it wears you out. If you're on a
road crew, Um, you're probably gonna be rotating out jackhammer duty. Yeah,
it's not like Chuck, You're on the jackhammer for ten
hours today for the rest of your life. Yeah. Yeah,
And it's a it's a real thing. Like people who
use jackhammers as their profession, they do face a lot
(22:00):
of problems. That dust is you know already mentioned that,
but concrete has a silica and that's been proven to
cause lung cancer. And so a lot of these jackhammers
will have a like a water sprayer at the end
of them that just constantly is introducing water that keeps
the dust on the ground and like a puddle. All right,
And what's the different or the deal with this. I
(22:21):
know you didn't get a chance to look at it,
but you sent a pretty interesting thing on the negative
effects of vibration on the human body. Yeah, it's weird.
What's the deal there? So vibrations are very odd. They
used to belong in the realm of Eastern Europe behind
the Iron Curtain. They did a lot of research in
the effects of vibration on the body, and it does
(22:44):
everything from cause insomnia to digestive issues to motion sickness.
And this is bad vibration. I mean there's also like
good vibration. There's also good, good, good vibration. There's there's
vibrations that that that that vibrated a certain frequency certain
hurts and I don't remember what it is, but it's
like a low it's like a low frequency vibration. And
(23:08):
there's there's something called whole whole body vibration which UM
apparently GM is dealing with a problem right now. They
have like their their largest UM I guess maybe they're
Tahoe or something, but they're large SUVs. They had to
really strengthen the cage so that if it rolled over,
(23:28):
it wouldn't crush the bottom of the truck, wouldn't crush
the roof. But the thing is so rigid that when
it goes at like highway speeds, it vibrates at this
this frequency that's perfect, and it's giving the driver's motion sickness.
So yeah, there's all this weird stuff that happens from
vibrations and exposure to vibrations, and so that's whole body.
(23:50):
There's also hand arm vibration and um, there's something called
raynodes phenomenon and it's basically like your hands being exposed
to vibrations for that many hours out of a day.
And this can happen too if you're if you're working
with like a gas powered weed whacker all the time,
or but especially a jackhammer operator is going to run
(24:11):
into this. This circulation gets basically cut off from all
the the exposure of vibration in your fingers and it
can get so bad, especially when it's cold out, that
they just turn white. It's called blanching. They lose sensation
if you're lucky. If you're not lucky, there's a tremendous
amount of pain in them. You can't grip things, and
if you're a jackhammer operator, that's a big problem because
(24:32):
you need to be able to grip the jackhammer. Yeah,
and um, I mean weird psychological issues brought on from
like fatigue, that constant noise, headaches, and the insomnia that
can all lead to you know, you're kind of losing
it a little bit. Yeah, Yeah, you never really thought
about that. All of it put together, it's called vibration sickness.
And we're only now just starting to like really understand it. Uh,
(24:55):
shrapnel is also a danger, of course. Um and and
these are you know, if you're on a construction site,
you know all this stuff. But since you can go
out and rent a full fledged jackhammer because you want
to take out your driveway this weekend, I think a
lot of people go into it lightly. Like I've seen
those things on the road. I can do that. Be careful,
(25:15):
like don't do it and flip flops or tennis shoes,
you know, get get your big heavy hobnail boot. It's
the great Larry Munson said, put those on. Get your
ear protection where, eye protection where long pants, and you know,
don't be a dummy. It all seems like basic safety issues,
(25:36):
but I bet you there's been a dude with short
pants and a flip flops they tried to jackhammer something.
Jackhammer right there. It'll happen. Oh. They also important thing
too if you're doing this at home. Um, and you
don't like your sidewalk um that leads to your house,
get the electrical and gas companies out there. And I
(25:59):
don't think they charged for it, or they might, but
they'll they'll come out there with a little spray can
and they will show you and draw paint on the
ground where your gas lines and your power lines are
because you do not want to jack camer into either
of those. Not fun, Be careful, don't be a dummy.
Well that's ours a huh yeah, jack hammers the most
(26:19):
interesting tool on the on the planet. I actually got
one more thing, believe it or not. What uh? In
two thousand because these things are so loud, you know, uh,
the Department of Energies Brookhaven National Laboratory released a helium
jack camera called the Raptor, and it had some of
these things come with rubber boots to try and soften
(26:42):
the noise, but I don't think they do a great job. Um,
this thing actually less than the noise to eighty seven decibels.
It's like nothing, nothing that's like how loud I'm talking
right now. But apparently it never like caught on. Then
in two thousand eleven, another equipment maker had an electric
model that said it's faster than neumatic and it's only
(27:02):
a hundred decibels and they have sold a few. But apparently,
like breaking into the construction industry with a new type
of tool is super hard to do. I think in
New York especially, they were very resistant. The unions were like,
really won't work, We're not using those. That seems like
where they should do it, because um I looked it up.
Apparently six of noise complaints and from in New York
(27:28):
City we're jack hammers. That's almost thirty four thousand complaints
in a year jack hammering New York. And supposedly you're
not supposed to do it after six or before seven am,
but there they allow it in certain cases, and I
feel like that is like all the case is chuck
in a hotel nearby. It started five. That's all I got. Uh.
(27:53):
If you want to know more about Jack Camers, you
can type that one word into the search bar at
how stuff works dot com. And since so I said
Jack Camera, it's time for listener mail. I'm gonna call
this cool program for kids in Austin, Texas. Oh yeah,
I hope you guys are doing well. I've been listening
to the show for for some time. I'd like to
thank you for giving me the edge on many debates
(28:16):
and discussions. I live in Austin, Texas, and I'm writing
today let you know about a program I recently started
working for but I think you'll appreciate. It's called a
Totally Cool, Totally Art t c t A. It is
a free after school program designed to reach out to
utes youth and give them some exposure to the arts.
The class I teach is called the Art of Machines,
(28:39):
and we build various contraptions. We have sent you an
example project, which we call bugs that the students building
our class. Did we get this? We haven't got in yet.
I don't think, all right, I don't think i've seen this, Brian.
So you sent it? Awhile ago, Oh we did? If
you did, I don't know if we got it. I
don't know. We haven't got any all right. So if
(29:00):
it's recent, Brian, then it's on the way. If not,
then send it again. That was one of a kind. Uh.
See what you think about is the proto time? I
hope not, he said. My dogs go crazy for these things. Uh.
This is the actual anniversary of the program. We're trying
to let people know about it so it can be
around for another twenty years. We also have other classes painting, film,
(29:22):
fiber arts, and photography. Anyway, I was just hoping maybe
you could give a quick shout out for totally Cool,
totally Art in Austin. It's so totally cool and you
can just look that up on Google or go to
uh h t t P S colon slash slash Austin,
Texas dot g O V slash t C t A.
(29:42):
That's nice. That's a secure site. Yeah, that's from Brian
fried tog and good work, buddy. And we're gonna be
in Austin for south By Southwest this year. Yeah. Do
you know if they're if we're gonna be selling tickets
or if there's like a registry or what. I don't know.
We'll find out and let everyone know. But I believe
it's going to our deal Live podcasts going down Sunday night. Yeah,
and um, but we're going to be around cooltown cool
(30:05):
look out for us Sunday night. Okay. Indeed, uh if
you want to get in touch of this, you can
tweak to us at s Y s K podcast. You
can join us on Facebook dot com slash Stuff you
Should Know. You can send us an email to Stuff
Podcast at how stuff Works dot com and has always
joined us at our home on the web, Stuff you
Should Know dot com. Stuff you Should Know is a
(30:28):
production of iHeart Radio's How Stuff Works for more podcasts
for my heart Radio because at the iHeart Radio app,
Apple Podcasts, or wherever you listen to your favorite shows,
Hey, everybody, this is Chuck here on a Saturday. It's beautiful,
it's sunny. It's actually rainy and cold. But maybe by
the time this rolls around it will be beautiful and sunny.
But I know in February six two sixteen, it was
not beautiful and sunny because we released an episode that
has gone down and stuff you should know history as uh,
from our point of view, quite possibly the most boring,
(00:23):
worst one. So I thought I would pick this one
and rerelease it into the world and just see if
it's as bad as I thought it was. This is
our very very infamous episode on Jackhammers. Yes, we did
an entire episode on Jackhammers and here it is right now.
(00:43):
Welcome to Stuff You should Know, a production of My
Heart Radios How Stuff Works. Hey, welcome to the podcast.
I'm Josh Clark. There's Charles w Chuck Bryant, and Jerry's
over there, which means time for Stuff you should know.
The Jackhammer edition coming at you. That's right, the most annoying,
(01:09):
one of the most annoying sounds. And I know you
hate the leaf blower. Yeah, it's established. I think the
camera up there. Sure, yeah, but we don't live in
New York if we lived in New York Jackhammer b
number one. I feel like I've never stayed in a
hotel in New York where there wasn't a jack below me,
not even a chance. Every single time leaf blower. It's
(01:33):
a lot more frequent down here in Atlanta than the jackhammer.
Not a lot of leaf blowers in New York City,
not a lot of leaves. Well, that's not necessarily true.
You've been somewhere you are. Uh So we don't usually
um shout out to thank you at the beginning of
an episode, but we got a couple of gifts that
are so special we want to do that. So Peter
(01:55):
O'Donnell in the gang at built Sharp Knives b I
l T Sharp out of Philly. H sent us, sent
me a chef's knife, sent you a filet knife beat
and it's one of the most gorgeous pieces of like
handmade craftsmanship I've ever seen. It's amazing. I cannot wait
(02:18):
to catch a fish. Oh dude, I can't wait for
that for you cut that thing open, yeah, after it's dead.
Uh really, you can't lock the head off while it's
still alive. They think you're supposed to you're supposed to
hit it with a hammer. I think some people do. Um,
I do not. These things are gorgeous. I mean the
(02:38):
blade itself, I mean the hand make these, the handle,
the weight, it's just it's a piece of art. And
not only that, it is the sharpest thing I've ever
seen in my life. It's like dangerous. Um, but I
don't want to you know, it's dangerous. They're knives. They're
supposed to be sharp, but wield it with respect. Well yeah,
(02:58):
well they're respectable. Live so um that you can actually
go into tumbler. You can just search hashtag knives. You
should know one word and it uh it chronicles and
pictures and short captions or brief captions the process of
them making our knives. It's awesome. Yeah, it's just really
neat and I just love like handcrafting and forging steel,
(03:21):
like those are lost arts in a lot of ways,
and um, they're doing it right man, they're really beautiful.
Cool man. So anyway, thank you, Yeah, thank you guys. Thanks.
It was really cool. So jack hammers, yeah, jack hammers.
If they were sharpest built sharp knives, they'd be onto something.
But I don't know if it would work. Quite the same,
Probably not so. Um, Yes, it's true we are actually
(03:43):
talking about jack hammers, and yes, it's true that jack
hammers are about what you think they are, but they're
also kind of interesting when you start to look into them. Right.
Oh yeah, well yes, so think about I didn't realize this.
This article points it out. Jack hammer is a hammer
and a chisel, but it's a hardcore hammer and chisel. Yeah,
(04:05):
and it takes out of the equation largely the human
who's back and shoulder muscles have to be involved in
every single strike of that hammer and chisel. You're talking
John Henry and the sledge hammer, Yes, exactly, because prior
to the advent of the jackhammer about eight fifties, by
the turn of the last century, we had jackhammers kind
(04:27):
of down pat um. It was sledge hammers and pick
axes to remove rock. It was a real deal that
was like killed people like it literally could kill you
with that kind of work. Yeah. I mean, mining is
still a very dangerous job, but pre Industrial Revolution mining
(04:49):
was no fun um, dangerous, deadly, and even if you
didn't die, it's just brutal, brutal back baking work, baking work, slinging,
as sledgehammer. Yeah, you ever slung a sledge it's the worst.
It's it's hard work. You ever used the jackhammer? No,
I haven't. It's awful. Well, that's the thing. It's better
(05:10):
than the sledgehammer. Yeah, well in some ways. But it's
brutally difficult. It is. It's probably one of the most
brutal tools you can use on any kind of site
and for any kind of project. There aren't that many
tools that there. They're gonna take as much out of
you as the jackhammers on your body. Yeah, because they
weigh about a hundred pounds, like a normal heavy duty
(05:31):
jackhammer weighs about a hundred pounds. You have to hold
it in place upright, because you don't want to jumping around,
although it's probably not going to anyway. It's it's designed
not to jump around, but you still have to. Um.
You want to kind of keep it in a fairly
confined area, which means you're using your muscles to study
it while it's going up and down at a very
(05:51):
very fast rate. Some of those things UM impact with
the ground one thousand to forty times a minute. It's tough.
It's it's the only tool that and the hardwood floor,
um skimmer, you know, like the orbital floor cleaner. You
can use that on like put a standing pad on
(06:12):
a hardwood floor, and that thing. And the sledge hammer.
The only time I've ever used tools that I felt
like we're controlling me and not me, not controlling the
tool until you get it. Once you get it, it's
a little better. But at first, when you first start
to use it. You can rent a jackhammer, you know. Yeah,
I mean, if you want to bust up your driveway,
you can go do it yourself. If you're a fool,
(06:34):
make sure that you don't need the driveway anymore before
you do that. Yeah. Yeah. But um, once you get
the hang of it, you kind of can wield it
a little bit. But it's tough. I mean, it feels
like I have no power or control over this thing, right,
I can imagine you know. So, Um, it is a
very difficult tool. But again, the alternative is early death,
(06:57):
and the other alternative, which is to call someone to
do it for you, is the best option of the three.
But so say that you are um King Carlo Alberto
of Sardinia and the years about eighteen thirty something, eighteen
forty and you want a train tunnel built through a mountain,
(07:18):
and the tunnel is gonna need to be twelve kilometers long.
You do call somebody else, but that somebody else you
call goes. I don't know what to tell you, buddy.
We could try pick axes or whatever, but you're not
still gonna be alive by the time we finished. What
can we do? And actually this call for a twelve
kilometer long tunnel through a mountain in Sardinia prompted the
(07:40):
early um the early forays into developing pneumatic tools like
a jackhammer. Yeah, in eighteen forty eight it got named
Jonathan Couch built a what he called a percussion drill,
and this had a bit that was it went through
the piston of a steam engine, so it was piston driven.
Then uh contemporary Joseph Foul actually attached it to the
(08:03):
piston and then he started in eightf one using air
which is pneumatic to power it. But these were still
attached to a piston. And it wasn't until Charles Brady
King when he actually has given credit for inventing the
traditional looking handheld modern jack modern pneumatic powered jackhammer, right,
(08:28):
and he gets a lot of credit for stuff that
was already built. Like a lot of people say he
was actually the inventor of the automobile. No he wasn't.
Oh well, he was the inventor of the gasoline powered automobile.
No he wasn't. He was the first guy in Detroit
to build and drive one around. Yeah, and he did
end up inspiring and mentoring Ransom Olds and Henry Ford
and some other early car manufacturers and is almost single
(08:50):
handily responsible for making Detroit motor city. This guy, but
he also Stanley right? Uh? And what's from his eights? Freely?
I like that guy's stuff? What do you mean didn't
he get kicked out of Kiss? Oh? I think he
was sort of not invited back. Yeah. I think it's
a money move. They don't have to pay the nameless
(09:12):
other guitar player nearly as well. He was a founder
of the band. Right, How do you get kicked out
like that for money? I think Paul Stanley and Jean
Simmons probably own Kiss Incorporated. I know. Anyway, Um, Charles
Brady King Uh, he put Detroit on the map as
far as auto manufacturer goes. And he did do a
(09:34):
lot of refining of pneumatic tools, including the jack hammer.
And he does hold the pattern, he did hold the
patent for it. Yeah, and he had been a lot
of stuff. He was a sharp guy. And the pneumatic,
the fact that it's pneumatic, which means air powered, compressed
air powered UM is the reason why most jackhammers today
are still compressed air powered. It's because of the mining
(09:59):
application an it. Yeah, like when you mind, you're releasing
a lot of potentially explosive gases and uh, you can't
have something like a steam engine that's combustion powered down there, yeah,
or you can't have an engine in there releasing exhaust. Um.
And you can't have a jackhammer that will spark a rock. Um.
(10:24):
Well that might happen no matter what. Right, Well, no,
that's what I'm saying. You can't have that among volatile gases.
So you've air driven is the perfect key, because it
doesn't matter if that hoses a thousand feet long. You're
not gonna lose power because it's gonna be Yeah, it's
gonna be compressed air up against compressed air, and up
on the surface. You've got a diesel engine that's powering
(10:45):
a piston just like in your car, and the piston
moves up and down the cylinder. As it moves down,
it compresses the air in the cylinder and pushes it
down into a storage tank where it sits a compressed
air and that's released out the other end through the
hose and it ends up into the jackhammer. And yeah,
no matter how far away it is, it's still going
to be just as powerful. And that compressed air is inflammable,
(11:08):
so you can be a happy miner all the live
long day. Well, buddy, you're getting excited, so that means
we need to take a break and put this pill
under your tongue and we'll come back right after this story.
(11:37):
How you feeling now, relaxed? Good? I love the title
of this next section, Air powered destruction. Um, you can
get an electric jackhamer. If you've ever gone to a
hardware store, they have these kind of smaller handheld jack
hammers that, um, you can take up like your bathroom
(11:59):
floor tile pretty well with it plugging into the wall.
Has a little chisel bit on the end of it. Um,
But that's small. Beans. You can't do a driveway or
concrete or asphalt with with something like that, or a
twelve kilometer tunnel through a mountain in Sardinia. No, you
need the big T shaped jack camera. And here's one
(12:19):
of the things that didn't really occur to me. One
of the reasons it works so well is because it's
so heavy. Right. It's not like things say, well, let's
make this thing way fifteen pounds or twenty pounds to
make it easier to run, which they probably could. Yeah,
you maybe could do that, but it would jump all
over the place. Yeah, you want that thing super super
heavy because that's part of the power and forced behind it.
That's right. So these things are pneumatic, right, And just
(12:41):
like on the compressed air compressor up on the surface
when you're done in the mine, they actually have a
jackhammer has a piston in a piston in a cylinder
in it, right, Okay, And it's it's actually a really
kind of simple when you cut the thing open and
draw a cross section of it, which we did, yeah,
(13:03):
on our hands for crib sheets. Um you you you
can see that. Really the whole mechanism comes down to
a trigger valve, right, that's right. So what you have
here is you got the pressure chamber. The compressed air
enters that chamber activates the trigger valve. And it just
because of the compressed air opens and shuts really fast, right,
(13:24):
and so the trigger valve moves the air either above
the piston or when it closes, the air goes down
below the piston, which means chisel goes up, chisel goes down, right,
because the piston is striking the top of that chisel bit,
driving it downward when the compressed air comes in and
pushes the piston down. And then when the valve closes
(13:46):
and the air goes underneath the piston, there's also a
spring in there that brings the drill bit back up.
Because it wouldn't work very well if you knock it down.
They had to go down and reset it. And apparently
the earliest um, the earliest Jackhammeer had that very designed
that feature. That was it like it go bam and
(14:06):
then you definitely like reset it bam and then reset
it and they're like, this isn't gonna work. Yeah, that's
sort of like the pneumatic cattle punch that they that
what's his face used in no Country for old men.
One way, it's exactly like that. Not very good if
you're trying to bust up concrete, but good if you
want to put on a cow. That's right. It doesn't
(14:28):
stunn them. It does the eternal stunt. I think it
stuns a cow and then they kill them. Oh I
thought it they put it into the brain to kill
the cow. I don't think it actually. I think it
can and probably does sometimes, but I think the main
purpose of it is to stun the cow, so it's
not like it's just dazed and out of it when
it when it, they kill it. Oh yeah, yeah. Uh.
(14:51):
Hydraulic jackhammers, it's the same. Uh jackhammer would kill a cow.
Hydraulics use fluid, same principle, but it doesn't use air.
And if you've ever seen the they have jackhammers you
can that are really large that you can't handle as
a person, but it's like attached to a backhoe or
something that's for big, big jobs. And those are usually
(15:13):
um hydraulic and pneumatic. Right, but probably not every time.
I'm sure someone in the construction industry will correct me
on that. Well. I went and looked, and if you
go on Alibaba that you know that's I has everything
and they have hydraulic jack hammers for sale. What's ali
baba is that like Skymall. It's like China's Amazon, but
(15:33):
they sell everything on it. It's nothing like Skymall. Do
you think everything's like skymallers because you want a skymall
to come back? I sure do. Um, but they it
did seem like all of the back hoe attached um
jack hammers were hydraulic that I saw. Okay, all right, well, um,
(15:53):
here's what happens at a thousand hits per minute. That
chisel bit and if you're breaking up rock. They're different
kinds of bits. A pointy bit if you're breaking up
like a driveway or something is really good, or you
can use a flat bit for other applications. So yeah,
if you're breaking up a driveway and all you want
is for the driveway to go bye by, Yeah, the
(16:15):
pointy bits the one you want because it's not a
controlled cut. The the the like a flathead screw driver
style bit is the kind that where you can really
kind of control where the cracking goes right or if
you wanna, uh, like I said, if you're taking up
your floor tile and you have the handheld version, that's
what you want to scoot it underneath the tile and
(16:35):
chip it up and there's actually there's like, um, some
insane mathematicians have actually like tried to figure out how
you can predict how cracks propagate. Yeah, there's like um
for the most efficient jackhammering pretty much like what bit
will work best, and like where to place it and
how to how to use it. But um, one of
(16:56):
the things that I didn't understand before is that when
you are jackhammering, you you are creating different types of
uh uh flaws basically in this solid say, concrete structure, right,
And when you're doing that, the first flaw you're doing,
the first flaw you're creating is this um kind of
(17:18):
surface powder that the the initial chips you're making are
actually powder izing and and congealing around the drill bit, right,
And that powder actually transmits the impact of the jackhammer
throughout the rest of the concrete pad in that immediate area,
and that actually starts to create cracks. So you think, well,
(17:40):
it's just the drill bit creating crack. It gets in
there enough. Actually no, it's it's generating like these different
materials from the very concrete itself, and it's using those
materials to distribute the force and create cracks that ultimately
start to spread and propagate, and as they spread and propagate,
they get bigger and bigger, and then a chip comes off.
(18:01):
And when the chip comes off, the amount of force
that's generated and there goes down again and you have
to build it back up by more jackhammering. But eventually
these larger cracks that you're making come together and then
big chunks break off. And then when a big chunk
breaks off, you want somebody to come in and clear
the chunks away while you move the jackhammer, because you're
just gonna be breaking up those chunks. And that's not
(18:23):
the point of jackhammer anymore. Now. The point is you're
trying to remove whatever material in his bigger pieces as
can be removed, you know, right, like by like a
bacco with a bucket or something. Um. Obviously it can't
be too big because you might have to break up
in a smaller bits. If you don't want a three
million little tiny rocks at the end of it, right,
(18:43):
you're not breaking it into gravel. No, the machines that
do that. Um, some of these things actually when when
you create a crater, that's good, but you don't want
your crater full of junk. So some of them actually
have air water that blast the stuff clear as you're going,
which is pretty neat too, Yeah, which is a it's
(19:05):
a big that's an issue because the stuff that that
dust that accumulates that forms what's called the crushed zone,
that powder that distributes the force um is actually can
be a health hazard. And there's actually a lot of
health hazards with jack hammers. Uh. And we'll talk about
them right after this, all right, Josh, health hazards of
(19:47):
jackhammering um that dust is no joke. Well, before we
go to health hazards, let me say this. What you
and actually can be a health hazard. It can be
dangerous when you get your bits stuck. Uh. And the
general rule of thumb is you don't want to put
the bit farther down. You don't want to keep going
down farther than the length of the bit, because if
(20:09):
you get your bit stuck, then it's really tough to
get back out. Yeah. And while it may give you
a little break, your boss didn't gonna be happy, or
if you're renting that thing by the hour at your house, yeah,
you're not gonna be happy. Yeah, because you just used
all of the force of that compressed air to jam
that that chisel bit several inches into concrete. Yes, it's not.
(20:30):
You need like King Arthur to get that out. Yeah,
so move it around, um inches at a time so
it doesn't go straight down into one spot. And you
want a sharp bit as well. Obviously a dull bit
is gonna get stuck easier and it's not going to
break up the material as well. Um. And like you
said at the beginning that the jackhammers one of the
noisiest tools around, it's the worst. It might be the
(20:53):
noisiest tool. Jack hammers um create a noise at about
hundred and thirty decibels from why this article says, Yeah,
that is the that is the sound of a jet
engine taking off. That's how that's how loud those things
are and driving here, no joke. I passed a dude
(21:14):
using a jack camera, huh. And he wasn't wearing your protection,
you know. I was just about to say, is I
bet you've never seen a jackhammer operator not use your protection?
I never have until today. That's nuts. Isn't that a
weird coincidence? Though? It is totally weird and like just dumb.
He's like screwed, I got health insurance. Uh, construction headphones
(21:36):
are a must. Um. And because we're talking about how
how much it wears you out. If you're on a
road crew, Um, you're probably gonna be rotating out jackhammer duty. Yeah,
it's not like Chuck, You're on the jackhammer for ten
hours today for the rest of your life. Yeah. Yeah,
And it's a it's a real thing. Like people who
use jackhammers as their profession, they do face a lot
(22:00):
of problems. That dust is you know already mentioned that,
but concrete has a silica and that's been proven to
cause lung cancer. And so a lot of these jackhammers
will have a like a water sprayer at the end
of them that just constantly is introducing water that keeps
the dust on the ground and like a puddle. All right,
And what's the different or the deal with this. I
(22:21):
know you didn't get a chance to look at it,
but you sent a pretty interesting thing on the negative
effects of vibration on the human body. Yeah, it's weird.
What's the deal there? So vibrations are very odd. They
used to belong in the realm of Eastern Europe behind
the Iron Curtain. They did a lot of research in
the effects of vibration on the body, and it does
(22:44):
everything from cause insomnia to digestive issues to motion sickness.
And this is bad vibration. I mean there's also like
good vibration. There's also good, good, good vibration. There's there's
vibrations that that that that vibrated a certain frequency certain
hurts and I don't remember what it is, but it's
like a low it's like a low frequency vibration. And
(23:08):
there's there's something called whole whole body vibration which UM
apparently GM is dealing with a problem right now. They
have like their their largest UM I guess maybe they're
Tahoe or something, but they're large SUVs. They had to
really strengthen the cage so that if it rolled over,
(23:28):
it wouldn't crush the bottom of the truck, wouldn't crush
the roof. But the thing is so rigid that when
it goes at like highway speeds, it vibrates at this
this frequency that's perfect, and it's giving the driver's motion sickness.
So yeah, there's all this weird stuff that happens from
vibrations and exposure to vibrations, and so that's whole body.
(23:50):
There's also hand arm vibration and um, there's something called
raynodes phenomenon and it's basically like your hands being exposed
to vibrations for that many hours out of a day.
And this can happen too if you're if you're working
with like a gas powered weed whacker all the time,
or but especially a jackhammer operator is going to run
(24:11):
into this. This circulation gets basically cut off from all
the the exposure of vibration in your fingers and it
can get so bad, especially when it's cold out, that
they just turn white. It's called blanching. They lose sensation
if you're lucky. If you're not lucky, there's a tremendous
amount of pain in them. You can't grip things, and
if you're a jackhammer operator, that's a big problem because
(24:32):
you need to be able to grip the jackhammer. Yeah,
and um, I mean weird psychological issues brought on from
like fatigue, that constant noise, headaches, and the insomnia that
can all lead to you know, you're kind of losing
it a little bit. Yeah, Yeah, you never really thought
about that. All of it put together, it's called vibration sickness.
And we're only now just starting to like really understand it. Uh,
(24:55):
shrapnel is also a danger, of course. Um and and
these are you know, if you're on a construction site,
you know all this stuff. But since you can go
out and rent a full fledged jackhammer because you want
to take out your driveway this weekend, I think a
lot of people go into it lightly. Like I've seen
those things on the road. I can do that. Be careful,
(25:15):
like don't do it and flip flops or tennis shoes,
you know, get get your big heavy hobnail boot. It's
the great Larry Munson said, put those on. Get your
ear protection where, eye protection where long pants, and you know,
don't be a dummy. It all seems like basic safety issues,
(25:36):
but I bet you there's been a dude with short
pants and a flip flops they tried to jackhammer something.
Jackhammer right there. It'll happen. Oh. They also important thing
too if you're doing this at home. Um, and you
don't like your sidewalk um that leads to your house,
get the electrical and gas companies out there. And I
(25:59):
don't think they charged for it, or they might, but
they'll they'll come out there with a little spray can
and they will show you and draw paint on the
ground where your gas lines and your power lines are
because you do not want to jack camer into either
of those. Not fun, Be careful, don't be a dummy.
Well that's ours a huh yeah, jack hammers the most
(26:19):
interesting tool on the on the planet. I actually got
one more thing, believe it or not. What uh? In
two thousand because these things are so loud, you know, uh,
the Department of Energies Brookhaven National Laboratory released a helium
jack camera called the Raptor, and it had some of
these things come with rubber boots to try and soften
(26:42):
the noise, but I don't think they do a great job. Um,
this thing actually less than the noise to eighty seven decibels.
It's like nothing, nothing that's like how loud I'm talking
right now. But apparently it never like caught on. Then
in two thousand eleven, another equipment maker had an electric
model that said it's faster than neumatic and it's only
(27:02):
a hundred decibels and they have sold a few. But apparently,
like breaking into the construction industry with a new type
of tool is super hard to do. I think in
New York especially, they were very resistant. The unions were like,
really won't work, We're not using those. That seems like
where they should do it, because um I looked it up.
Apparently six of noise complaints and from in New York
(27:28):
City we're jack hammers. That's almost thirty four thousand complaints
in a year jack hammering New York. And supposedly you're
not supposed to do it after six or before seven am,
but there they allow it in certain cases, and I
feel like that is like all the case is chuck
in a hotel nearby. It started five. That's all I got. Uh.
(27:53):
If you want to know more about Jack Camers, you
can type that one word into the search bar at
how stuff works dot com. And since so I said
Jack Camera, it's time for listener mail. I'm gonna call
this cool program for kids in Austin, Texas. Oh yeah,
I hope you guys are doing well. I've been listening
to the show for for some time. I'd like to
thank you for giving me the edge on many debates
(28:16):
and discussions. I live in Austin, Texas, and I'm writing
today let you know about a program I recently started
working for but I think you'll appreciate. It's called a
Totally Cool, Totally Art t c t A. It is
a free after school program designed to reach out to
utes youth and give them some exposure to the arts.
The class I teach is called the Art of Machines,
(28:39):
and we build various contraptions. We have sent you an
example project, which we call bugs that the students building
our class. Did we get this? We haven't got in yet.
I don't think, all right, I don't think i've seen this, Brian.
So you sent it? Awhile ago, Oh we did? If
you did, I don't know if we got it. I
don't know. We haven't got any all right. So if
(29:00):
it's recent, Brian, then it's on the way. If not,
then send it again. That was one of a kind. Uh.
See what you think about is the proto time? I
hope not, he said. My dogs go crazy for these things. Uh.
This is the actual anniversary of the program. We're trying
to let people know about it so it can be
around for another twenty years. We also have other classes painting, film,
(29:22):
fiber arts, and photography. Anyway, I was just hoping maybe
you could give a quick shout out for totally Cool,
totally Art in Austin. It's so totally cool and you
can just look that up on Google or go to
uh h t t P S colon slash slash Austin,
Texas dot g O V slash t C t A.
(29:42):
That's nice. That's a secure site. Yeah, that's from Brian
fried tog and good work, buddy. And we're gonna be
in Austin for south By Southwest this year. Yeah. Do
you know if they're if we're gonna be selling tickets
or if there's like a registry or what. I don't know.
We'll find out and let everyone know. But I believe
it's going to our deal Live podcasts going down Sunday night. Yeah,
and um, but we're going to be around cooltown cool
(30:05):
look out for us Sunday night. Okay. Indeed, uh if
you want to get in touch of this, you can
tweak to us at s Y s K podcast. You
can join us on Facebook dot com slash Stuff you
Should Know. You can send us an email to Stuff
Podcast at how stuff Works dot com and has always
joined us at our home on the web, Stuff you
Should Know dot com. Stuff you Should Know is a
(30:28):
production of iHeart Radio's How Stuff Works for more podcasts
for my heart Radio because at the iHeart Radio app,
Apple Podcasts, or wherever you listen to your favorite shows,
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