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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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During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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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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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.