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Thyroid conditions may make getting pregnant impossible.
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There are more bacteria in your mouth than there are people in the world.
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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
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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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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.