Video Description

🗣️ Visit https://protectmypublicmedia.org/ to voice your support for PBS. Remove your personal information from the web at http://joindeleteme.com/BESMART and use code BESMART for 20% off ↓↓↓ More info and sources below ↓↓↓ Across life on Earth, blood comes in red, blue, green, purple, even clear. But why? And what makes your blood different from mine? This video will teach you everything you need to know about the strange world of blood—what it does, why it varies, and why we can’t live without it. References: https://sites.google.com/view/be-smart-blood-types/ ----------- High fives to all our Brain Trust Patrons: Marcus Pingel Olivia Ruiz Mike and Patty Loftis Ed Eyden Jennifer Burton Holly, Brett, and Ashe Bullion Jaap Westera Barbora Bei dani bowman David Johnston Baerbel Winkler Eric Meer Karen Haskell SUBSCRIBE so you don’t miss a video! ►► http://bit.ly/iotbs_sub Join us on Patreon! https://patreon.com/itsokaytobesmart Instagram http://www.instagram.com/DrJoeHanson http://www.instagram.com/okaytobesmart Facebook https://www.facebook.com/itsokaytobesmartpbs/ Merch https://store.dftba.com/collections/its-okay-to-be-smart