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The human body produces and destroys 15 million blood cells every second.
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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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The longest a person has survived after a heart transplant is 24 years.
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The horizontal fraction bar was introduced by the Arabs.
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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.