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There are more nerve cells in one human brain than there are stars in the Milky Way.
As many as 20% of Americans have been infected by the fungus known as Histoplasmosis. While most people are asymptomatic or only have slight symptoms, infection can progress to a rapid and potentially fatal superinfection.
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.
A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
The longest a person has survived after a heart transplant is 24 years.