3 ms·
Quite a number of humans are tetrachromat:https://en.wikipedia.org/wiki/Tetrachromacy https://en.wikipedia.org/wiki/Tetrachromacy
by andi999 6y ago
Quite a number of humans are tetrachromat:https://en.wikipedia.org/wiki/Tetrachromacy https://en.wikipedia.org/wiki/Tetrachromacy