Posted: Aug 11, 2017 1:55 pm
A few centuries ago, there may well have been people in Africa (the Himba) who did not see blue at that time, due to natural selection:
http://www.rationalskepticism.org/post1478006.html?hilit=Himba#p1465403
These days, they do see blue, but probably only due to interbreeding with the Hereros (see the linked posts).
http://www.rationalskepticism.org/post1478006.html?hilit=Himba#p1465403
These days, they do see blue, but probably only due to interbreeding with the Hereros (see the linked posts).