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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).
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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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The familiar sounds of your heart are made by the heart's valves as they open and close.