Part IIBeing Human

Being Human

For about 30 minutes, you existed as a single cell. Nine months later, you were born with over 300 bones in your body; yet, you will die with 206.1 Twenty-two of these form your skull and contain twelve paired cranial nerves, the second being your optic nerve. At just one millimeter wide, it connects your brain to everything visual in the world. On a clear night, your eye can detect a candle’s flickering light 30 miles away.2 Your sense of smell is no less impressive; the human nose can detect a single drop of perfume in an adjacent room, as well as thousands of scents.3 Each of your fingertips can touch your thumb, and you blush—both of which are unique traits among primates. You hiccup for no apparent reason, as ...

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