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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.
The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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.
The longest a person has survived after a heart transplant is 24 years.