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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Children of people with alcoholism are more inclined to drink alcohol or use hard drugs. In fact, they are 400 times more likely to use hard drugs than those who do not have a family history of alcohol addiction.
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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.