Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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Our eyes are always the same size from birth, but our nose and ears never stop growing.
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When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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There's a woman named Veronica Seider who had vision 20x better than average. She could identify people more than a mile (1.6km) away.
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Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130
Sheep, goats, octopuses, and toads have rectangular pupils.
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