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Anonymous File :-(, x)
After humans split ways with proto-chimps, we developed a mutation that turns the whites of the eyes... well, white. In apes the sclera (the part of the eye that is white in humans) is actually dark, but every now and then a chimp is born with white sclera, and these individuals look eeriely human.
So, why did this mutation become so popular among humans? A common explanation is that it allows us to see where someone is looking much more accurately, from a longer distance, and even if the head is not moved at all. Of all the apes, we have the most need to communicate and cooperate on several levels. We also communicate the most with our eyes, with the direction of the gaze alone, starting even with small babies. That's why we need a clear contrast between the iris and the sclera.
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