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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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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.