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Author Question: A nodule is a fluid filled sac located under the skin. (Read 29 times) |
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
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There are 20 feet of blood vessels in each square inch of human skin.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.