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Blood is approximately twice as thick as water because of the cells and other components found in it.
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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.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The average office desk has 400 times more bacteria on it than a toilet.
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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).