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If cold isn't real, then how can I feel it?
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You've felt cold before. Sometimes it's cold outside. But what if I told you that "cold" isn't real? There's no substance or quantity called "cold" in science. We can't measure the amount of "cold" in something. Instead it's about what's NOT there. In this week's video, learn the difference between heat and temperature, why a wind makes us feel colder, and what it's like to live as a mass of jiggling atoms. This is the physics of cold
Cool PBS NOVA episode on the search for absolute zero:    • Видео  

Richard Feynman on jiggling atoms:    • Feynman: What things really are like FUN T...  

The movement of atoms in a wind: http://www.newton.dep.anl.gov/askasci...

Why a breeze feels cool: http://physics.stackexchange.com/ques...

Density of the interstellar medium: http://en.wikipedia.org/wiki/Interste...

Have an idea for an episode or an amazing science question you want answered? Leave a comment below!

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It's Okay To Be Smart is written and hosted by Joe Hanson, Ph.DFollow me on Twitter: @jtotheizzoe
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For more awesome science, check out: http://www.itsokaytobesmart.com
Produced for PBS Digital Studios

Joe Hanson - Creator/Host/Writer
Joe Nicolosi - Director
Amanda Fox - Producer, Spotzen IncKate Eads - Associate Producer
Andrew Matthews - Editing/Motion Graphics
Katie Graham - Director of Photography
John Knudsen - Gaffer
Dalton Allen - Post-Production Intern

Theme music:
"Ouroboros" by Kevin MacLeod

Other music via APM

Stock images from Shutterstock

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Last week's video:
How many smells can you smell?    • How Many Smells Can You Smell?  

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The Science of Game of Thrones -    • The Science of Game of Thrones  
There Was No First Human -    • There Was No First Human  
How The Elements Got Their Names -    • How The Elements Got Their Names