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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

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There are 20 feet of blood vessels in each square inch of human skin.

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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

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

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Patients should never assume they are being given the appropriate drugs. They should make sure they know which drugs are being prescribed, and always double-check that the drugs received match the prescription.

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