Thought Spiral 4

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-It's possible to brush your teeth too aggressively. It can wear down the enamel and cause teeth to be sensitive to hot/cold foods or drinks.

-Wisdom teeth serve no purpose

-Scientists don't know why we yawn.

-Your fingernails don't grow after you're dead.

-Humans are the only animals with chins.

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

-Blood makes up about 8% of your total body weight.

-When cracking your knuckles, gas bubbles are just bursting in your joints so that's why you hear a popping sound.

-Your skin is the your body's largest organ.

-On a genetic level, all humans are more than 99% identical.

-A surgical procedure called selective amygdalohippocampectomy could remove your sense of fear.



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