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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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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.