What are Blood Types?

Quick Questions explains why, when it comes right down to it, there are really only eight kinds of people in the world.
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Sources:
http://www.ncbi.nlm.nih.gov/books/NBK2261/
http://www.nobelprize.org/educational/medicine/landsteiner/readmore.html
http://anthro.palomar.edu/blood/Rh_system.htm
http://www.nlm.nih.gov/medlineplus/ency/article/002223.htm
http://www.rcsb.org/pdb/101/motm.do?momID=21
http://learn.genetics.utah.edu/content/inheritance/blood/
http://www.northshore.org/community-events/donating-blood/blood-types/
http://www.redcrossblood.org/learn-about-blood/blood-types

Видео What are Blood Types? канала SciShow