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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.
During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
Asthma cases in Americans are about 75% higher today than they were in 1980.