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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.