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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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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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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.