Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: If cold isn't real, then how can I feel it? Subscribe to It's Okay To Be Smart: ↓ More info and sources below ↓ Follow on Twitter: Follow on Tumblr: Follow on Instagram: 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: Richard Feynman on jiggling atoms: The movement of atoms in a wind: Why a breeze feels cool: Density of the interstellar medium: Have an idea for an episode or an amazing science question you want answered? Leave a comment below! ----------------- It's Okay To Be Smart is written and hosted by Joe Hanson, me on Twitter: @jtotheizzoe Email me: itsokaytobesmart AT gmail DOT com Facebook: Google+ +itsokaytobesmart For more awesome science, check out: 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 ----------------- Last week's video: How many smells can you smell? More videos: Why Are Some People Left-Handed? Why Did We Blow on NES Games? The Science of Game of Thrones - There Was No First Human - How The Elements Got Their Names -