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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.
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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.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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Your heart beats over 36 million times a year.
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The familiar sounds of your heart are made by the heart's valves as they open and close.