Could early man only see three #colors?
http://www.straightdope.com/columns/read/449/could-early-man-only-see-three-colors
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Verona - Italy New York, NY - U.S.A.
Education is your shield and trophy
http://uk.businessinsider.com/what-is-blue-and-how-do-we-see-color-2015-2?r=US&IR=T