Watch as Chuck gives Josh a minute-long crash on blood types. With over thirty human blood group systems Chuck has a lot of information to share. Can Josh remember it all? Tune in to find out. http://www.howstuffworks.com/ http://www.facebook.com/StuffYouShouldKnow http://twitter.com/SYSKPodcast http://itunes.apple.com/us/podcast/stuff-you-should-know-video/ http://itunes.apple.com/us/podcast/stuff-you-should-know/
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