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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
Hyperthyroidism leads to an increased rate of metabolism and affects about 1% of women but only 0.1% of men. For most people, this increased metabolic rate causes the thyroid gland to become enlarged (known as a goiter).
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.

