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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.