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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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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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Computer programs are available that crosscheck a new drug's possible trade name with all other trade names currently available. These programs detect dangerous similarities between names and alert the manufacturer of the drug.
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Blood is approximately twice as thick as water because of the cells and other components found in it.