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 brain doesn't stop developing until about 25 years old.
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The average person's skin weighs twice as much as their brain.
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Every human spent about half an hour as a single cell.
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Cats have a weak sense of taste. They have only 473 tastebuds, humans have 9,000.
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A third of the human population sneezes when they look at the Sun. Light can signal the ocular nerve near the sinuses and triggers a sneeze.
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