Those things you see in your eyes when you stare into space are called Mouches Voltanes, which are also broadly referenced to as Floaters.
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Only about 2% of the world population has green eyes.
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Optical illusions occur when what the eyes see conflicts with what the brain expects.
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Tigers can see 6 times better at night than humans.
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In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
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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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All humans have the ability to see ultraviolet light, but it is passively filtered out by the eye's lens. People who undergo surgery to remove the lens can detect ultraviolet light.
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