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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The human eye blinks an average of 4,200,000 times a year.
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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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In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
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Sheep, goats, octopuses, and toads have rectangular pupils.
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The colossal squid has the largest eyes in the world.
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The focusing muscles of the eyes move around 100,000 times a day. To give your leg muscles the same workout, you would need to walk 80km (50 miles) every day.
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Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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