1. It’s possible to brush your teeth too aggressively. Doing so can wear down enamel and make teeth sensitive to hot and cold foods.
2. Goose bumps evolved to make our ancestors’ hair stand up, making them appear more threatening to predators.
3. Wisdom teeth serve no purpose. They’re left over from hundreds of thousands of years ago. As early humans’ brains grew bigger, it reduced space in the mouth, crowding out this third set of molars.
4. Scientists aren't exactly sure why we yawn, but it may help regulate body temperature.
5. Your fingernails don’t actually grow after you’re dead.
6. If they were laid end to end, all of the blood vessels in the human body would encircle the Earth four times.
7. Humans are the only animals with chins.
8. 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.
9.Blood makes up about 8 percent of your total body weight.
10. The human nose can detect about 1 trillion smells.
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