Why do humans have all kinds of different blood types? What is A, B, AB and O all about? Click here to see more videos: http://www.m301.me/lifenoggin Life Noggin is a weekly animated educational series. Whether it's science, pop culture, history or art, we explore it all and have a ton of fun doing it. Follow Us! https://twitter.com/LifeNoggin https://facebook.com/LifeNoggin https://www.LifeNoggin Life Noggin Team: Animation & Designed by: http://www.jmccartney3d.com/ Voiced by: http://youtube.com/patdoesit Produced by: http://www.IanDokie.com Written by: https://www.youtube.com/coconutcab Sources: http://www.redcrossblood.org/learn-about-blood/blood-types http://www.ncbi.nlm.nih.gov/books/NBK2267/ http://www.ncbi.nlm.nih.gov/books/NBK2264/