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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.

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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.

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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

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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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Medication errors are three times higher among children and infants than with adults.

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