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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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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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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.
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The average office desk has 400 times more bacteria on it than a toilet.
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The familiar sounds of your heart are made by the heart's valves as they open and close.