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There are 20 feet of blood vessels in each square inch of human skin.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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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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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.