BrainStuff
Whether the topic is popcorn or particle physics, you can count on BrainStuff to explore -- and explain -- the everyday science in the world around us.
July 9, 2014 • 4 min
The National Fire Protection Agency, or NFPA, uses these signs to indicate hazardous materials stored in an unknown building. Listen in to learn how the signs work -- and how they help firefighters -- in this podcast from HowStuffWorks.com.
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Josh Clark
Jonathan Strickland
Ben Bowlin
Lauren Vogelbaum
Cristen Conger
Christian Sager
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