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The horizontal fraction bar was introduced by the Arabs.
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Your heart beats over 36 million times a year.
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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.
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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.