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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).