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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
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The familiar sounds of your heart are made by the heart's valves as they open and close.