Episode Transcript
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Speaker 1 (00:04):
Hey, and welcome to the short stuff. Josh here, chuck here,
giddy up.
Speaker 2 (00:08):
Yeah, we're going to tell you in part about a
remarkable young teenager in Tanzania in the nineteen sixties, and
his name was Rasto im Pimba.
Speaker 1 (00:18):
Is it Impemba, It's in Pimpa, Okay. The reason why
we're talking about Rasto and Pemba today is because he
was a pretty remarkable kid. He stumbled upon I guess
you could say rediscovered a concept that just baffles physicists
today because it doesn't make any sense, it may violate
(00:41):
the second law of thermodynamics. And it ended up being
named after him because he was a persistent little cuss
who made this observation and just kept going until he
finally got the ear of somebody who could help him
try to figure it out.
Speaker 2 (00:55):
You know, the first law of thermodynamics is you don't
talk about thermo dynamics.
Speaker 1 (01:00):
I was thinking about that movie the other day. I
was like, I used to be so into that, and
now I'm so juvenile.
Speaker 3 (01:06):
I know.
Speaker 2 (01:06):
I almost put it on the other day as a
laundry folding movie, which I like to do just to
see parts of And I.
Speaker 3 (01:16):
Had the same thought. I was like, I don't know
if I just even want to go down that road again.
Speaker 1 (01:19):
Yeah, because it exists happily in the past, you know
what I mean exactly? I heard at the premiere Brad
Pitt leaned over to Edward Norton and said, I'll never
be in a movie this cool again, And he was right.
I think he was. So. Yeah, we're talking about Arresto
and Pemba because he discovered what's called the Mpemba effect
(01:40):
after him, and I think I said earlier that he
rediscovered it. It was first noticed by Aristotle, or at
least it was first written about all the way back
to Aristotle. Medieval scientist Roger Bacon mentioned it as well,
so did the Enlightenment philosopher Renee des Cartes. And what
they all noticed and what Erastom and Pemba got his
his name attached to, is that hot liquids placed in
(02:05):
a freezer can freeze faster than cool liquids placed in
the same freezer at the same time. It makes no
sense whatsoever.
Speaker 2 (02:15):
Yeah, he discovered this as a thirteen year old. He
was in class in Tanzania and they were making in
school and they were making ice cream as a class.
I don't know if that was for fun or if
it was part of science. I like to think it's
part of science. But regardless, he you know, they added
sugar to the boiling fresh milk. You let it cool,
you put it in a container, you put it in
(02:36):
the freezer. They were doing this again another day. I
bet they just like it ice cream now, then I
think about it. Sure, he was like, Hey, the freezer
space is getting low, and I want to make my
special ice cream. So he's like, I'm not going to
let this stuff cool down. I'm just going to go
grab that spot while it's available. And an hour and
a half later he was like, hey, everybody, my ice
(02:57):
cream is ready before yours.
Speaker 3 (02:58):
In your face.
Speaker 1 (03:00):
Yeah, and he said, but that doesn't make any sense
because I put that hot milk in, so why would
mine have frozen at all? And he went to his teacher,
and his teacher said, I got too much to deal with,
so you run along, Rasto.
Speaker 3 (03:14):
Yeah, I'm not curious like you.
Speaker 1 (03:16):
No, and Erasto was undeterred over the years. Teacher after
teacher as he made his way through middle school and
the high school, he would talk to them about this
discovery and he was dismissed by all of them. And
then finally, one day at his high school, a physicist
who was a visiting physicist to the University of Darus Salam.
He was a British guy named Dennis Osborne. He came
(03:39):
to give a lecture and Rasto and Pemba saw his
chance and said, Professor Osborne, I've got something that may
knock your socks off. Check this out, do.
Speaker 2 (03:49):
You think In the teacher's lounge over the years, everyone
was like, hey, has and Pimba hit.
Speaker 3 (03:54):
You up about this ice cream business.
Speaker 2 (03:57):
Yes.
Speaker 1 (03:57):
Yeah, they're all drinking wine and rolling, so annoying.
Speaker 3 (04:00):
All the scientific curiosity out of this kid.
Speaker 1 (04:03):
I know. Luckily, Dennis Osbourne was like, ooh, I like that.
Let's talk a little more about it.
Speaker 2 (04:09):
He likes this kid, and they he invited him in
to you know, to perform experiments to see if it worked.
And then by nineteen sixty nine, I guess Impemba is
nineteen years old. By this point, they had written a
paper on this phenomenon and he was like, hey, buddy,
we got a name after you.
Speaker 1 (04:26):
Yeah, which I'm sure he was like, heckynah, let's take
a break and we'll talk a little more about the
Impemba effect itself. How about that, right, Okay, Chuck. So,
(04:55):
the reason that the Mpemba effect is so strange is because,
according to the laws of thermae dynamics, molecules that are
moving much faster than other molecules in say, like a
hot liquid and a cold liquid, they take longer to
slow down. And part of the very process of slowing
(05:15):
down temperature, by the way, as a measurement of the
excitement or movement of molecules in a substance, right, part
of the process of slowing down is that it takes time.
So it makes no sense intuitively, but also according to
the laws of physics that a hot liquid with faster
moving molecules could get to the point of freezing faster
(05:36):
than a cooler liquid with slower moving molecules, because they're
both trying to get to the point where they stop
moving in are solid blocks of ice.
Speaker 2 (05:45):
Yeah, it would just make intuitive sense that something colder
and closer to that temperature would do it faster. You
can also observe this if you go out in Let's
say you live in Minneapolis and it's January. You go
outside with a cup of warm water and throw it
into the air. That will go into an icy mist
(06:06):
instantaneously if it's cold enough. If you do that same
thing with a glass of cold water, that won't happen.
Speaker 1 (06:12):
No, yeah, are you serious?
Speaker 3 (06:14):
Yeah?
Speaker 1 (06:15):
Are you pulling my leg?
Speaker 3 (06:16):
No?
Speaker 2 (06:16):
I mean that's I saw a video of it, and
that's what they say. Is another example that's really great.
Speaker 3 (06:21):
I don't have first hand experience because it doesn't get
that cold here.
Speaker 1 (06:24):
Very cool though.
Speaker 3 (06:26):
No.
Speaker 1 (06:26):
Instead, you can fry an egg on a sidewalk, am
I right? Yeah?
Speaker 3 (06:29):
Right?
Speaker 1 (06:30):
So I guess essentially a good analogy that I came
up with, That's why I think it's good is that
Erasso and Pemba basically found that there's a foot race
between like hot water and cold water, and that, well,
I screwed up my analogy already, Chuck, do you want
to take it?
Speaker 2 (06:49):
I believe that there's a foot race, but one racer
has started sooner, yet the one behind gets there quicker,
even though they should supposedly be running at the same
rate of speed. This happens at braves games. Oh and
you know what, it's mister Freeze who they're racing.
Speaker 3 (07:07):
Isn't that funny?
Speaker 1 (07:07):
Oh wow. So they're clearly fans of the Mpemba effect.
Speaker 2 (07:10):
There's a track, clearly a track guy dressed up as
mister Freeze and they let a person from the stands.
They bring him down in the outfield and they they
give them a pretty long, like a quarter of the
distance head start, and then mister Freeze starts and you
almost always lose. But a young woman the other day
beat mister Freeze and it was it's on YouTube. It's
(07:34):
very cool to watch because you could tell that she
knew what she was doing.
Speaker 3 (07:37):
Nice because she was.
Speaker 2 (07:39):
Not running that hard until mister Freeze went. She was
running at a decent clip. And then as soon as
they hit the timer for mister Freeze to start, she kicked.
Speaker 3 (07:47):
It into the next gear wow and whipped him. It
was great.
Speaker 1 (07:51):
That's awesome. I remember they used to have giant hammers
and rulers and stuff. Oh they started on depot racing. Yeah,
they have multiple whole races at Home Braves Games. Now.
Speaker 2 (08:02):
Yeah, they got mister Freeze and they have the home
Depot hammer drill.
Speaker 3 (08:07):
I can't remember what the third.
Speaker 1 (08:08):
One was, so silly. I gotta go this year man.
Speaker 3 (08:12):
Yeah, I've been to a few games. Well, let's go
they stink?
Speaker 1 (08:18):
Oh really?
Speaker 3 (08:18):
Oh yeah, the braves are terrible this year. It's very
big disappointment. But you know, what are you gonna do?
Speaker 1 (08:24):
Or braves? So yeah, that was a great analogy, Chuck,
way to go.
Speaker 3 (08:28):
Thanks.
Speaker 1 (08:29):
So it turns out that answering this weird problem has
been trickier than you'd think, Trickier than physicists thought. Yeah,
because some physicists conducting experiments and the Mpemba effect have
shown yep, this is definitely a thing. Other experimenters have
not turned up any results, and they're like, no, I
don't know what you're talking about. And so the fact
(08:49):
that it happens under some cases and not others is
not only even weirder, it also suggests to dissenters. People
are like, there's no such thing as the Impemba effect. Yeah,
but there's some variable that some experimenters aren't taking into effect.
It could be different mineral contents in the water. It
could be convection cells in the warmer water are causing
(09:11):
it to freeze faster. It could be that our freezers
work harder on warmer air than cooler air, so it'll
freeze faster in a freezer. They don't know, but they're like,
there's no such thing as the Impemba effect. It's really
just some mistaken variable in the experiments.
Speaker 3 (09:27):
Yeah, for sure.
Speaker 2 (09:28):
And there's also a long argument about this about what
freezing first actually means, Like you have to if you're
gonna do something like this, you got to agree what
that when you're technically freezing and who got there first.
It's not like mister Freeze running across that finish line
and hitting his chest to that tape.
Speaker 3 (09:44):
No, that's obvious. So you got to agree on freeze first?
Speaker 2 (09:48):
Is that? Like, hey, is it the first one to
reach thirty two degrees fahrenheit zero degree celsius if it
starts to form ice crystals, if it's good enough to
put in a cocktail without getting too water down. And
I'm gonna let you take MIT's engineering school response because
it was very actually, guys, and not at all helpful.
Speaker 1 (10:08):
It totally was. There was a blog post by them
that basically said, all liquids freeze at the same rate
once they reach the freezing temperature, so no liquid can
technically freeze faster than another. And you got the impression
they really thought that they had solved the Impemba effect.
Speaker 3 (10:24):
Yeah, that's not what we're talking about. Mit, No, the
one is talking about that.
Speaker 1 (10:28):
No, the rest of the world is like, Nope, we're
talking about if you put a warm cup of water
and a cool cup of water in a freezer at
the same time, not once, what happens once they reach freezing.
So if you even if you say, okay, we're going
to talk about, like we're going to use as the
milestone or the finish line, which of these things gets
to thirty two years farentheight or zero degrees celsius first
(10:52):
the freezing point. Yeah, there's still a big discrepancy in
how you track this kind of stuff. Yeah, and different
experimenters have been using essentially what you call like different stopwatches,
even though they're not actually standing there with a stopwatch.
And it wasn't until some researchers from Kyoto in twenty
twenty five basically figured out a measurement standard that any
(11:14):
lab could use to test the Mpemba effect. So now
all of these experiments are going to be comparing apples
to apples for results and hopefully we'll get to the
bottom of it.
Speaker 2 (11:24):
Yeah, for sure, this is the part that I think
is the coolest is that some researchers out there are like, hey,
I guess in principle, I agree that we're not noticing
some variable, but we feel like we've accounted for all
the variables and perhaps there might be some unknown variable
that we haven't discovered yet.
Speaker 1 (11:44):
Yeah, like some force or effect in nature that's just
undiscovered that we're seeing in the Mpemba effect. Yeah, I'd
love that to you. So you might say, like, Okay,
aside from just science being curious and wanting to know
the answers to everything, like what's the point in studying
the by effect? And I was very surprised to find
that there's a lot of reasons to understand this that
(12:05):
just knowing how fluid dynamics or systems under fluid dynamics
relax or cool it would actually open up or overcome
a huge hurdle that quantum computing is facing right now.
They have to figure out how to get quibits, which
are the quantum computing version of ones and zeros and
(12:26):
traditional computers back to their ground state as fast as possible.
So if you can figure out how something like molecules
stop moving faster than cool molecules, hot molecules. You might
be able to apply that to quantum computing, and that
would be a huge leap.
Speaker 2 (12:41):
Forward for it, totally, Yeah, because cooling those things down
takes a lot of energy, and I want to do
an episode about the AI's environmental cost at some point soon.
Speaker 1 (12:53):
Okay, Sure, you could also develop new sensors, new materials,
and at the base you could also make better freezers
and refrigerators.
Speaker 3 (13:04):
Too, Yeah, for sure.
Speaker 2 (13:06):
As for Impimba himself, he overcame a lot of obstacles
to eventually have a nice long career as a game warden,
and very sadly just passed away a couple of years
ago in twenty twenty three.
Speaker 1 (13:16):
But he was older, right, twenty Yes, seventy three.
Speaker 3 (13:19):
That's not yeah, and it's not a bad life. But
our scientific curiosity had his off to you.
Speaker 1 (13:25):
Sir, Yes, And that means short stuff is appen.
Speaker 3 (13:31):
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