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There are more nerve cells in one human brain than there are stars in the Milky Way.
On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
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.