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Did you know?
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.
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The horizontal fraction bar was introduced by the Arabs.