Mental Floss

BIOLOGY

A lot of the methods involved pee.

Before home pregnancy tests, the most reliable test was just to wait and see. But people still wanted to know as early as possible whether they were harboring a tiny human.

Linda Rodriguez McRobbie






The average adult human has 28 to 32 teeth, give or take a set of wisdom teeth. But besides the importance of brushing and flossing, how well do you know your chompers?

Amanda Green


















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You might think that urine is just bodily waste—but you would be wrong. It's been used in cleansers, medicine, and infertility treatments for centuries.

Stan Shunpike