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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 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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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.