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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.