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HUMAN BODY FUN FACTS

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1. Goosebumps evolved to make our ancestors’ hair stand up, making them appear more threatening to predators.

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3. If they were laid end to end, all of the blood vessels in the human body would encircle the Earth four times.

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 5.  The human nose can detect about 1 trillion smells.

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7. Belly buttons grow special hairs to catch lint. 

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9.   Your tongue is made up of eight interwoven muscles, similar in structure to an elephant’s trunk or an octopus’s tentacle.

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2. Scientists aren't exactly sure why we yawn, but it may help regulate body temperature.

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4. Humans are the only animals with chins.

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6. As you breathe, most of the air is going in and out of one nostril. Every few hours, the workload shifts to the other nostril.

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8. Hair grows fast—about 6 inches per year. The only thing in the body that grows faster is bone marrow.

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10.  The satisfying sound of cracking your knuckles comes from gas bubbles bursting in your joints.

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11.   The heart beats more than 3 billion times in the average human lifespan.

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13.   Extraocular muscles in the eye are the body’s fastest muscles. They allow both of your eyes to flick in the same direction in a single 50-millisecond movement.

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12.  A surgical procedure called a selective amygdalohippocampectomy removes half of the brain’s amygdala—and with it, the patient’s sense of fear.

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14. On a genetic level, all human beings are more than 99 percent identical.