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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.
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Most fungi that pathogenically affect humans live in soil. If a person is not healthy, has an open wound, or is immunocompromised, a fungal infection can be very aggressive.
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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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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.