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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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To combat osteoporosis, changes in lifestyle and diet are recommended. At-risk patients should include 1,200 to 1,500 mg of calcium daily either via dietary means or with supplements.
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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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The human body produces and destroys 15 million blood cells every second.