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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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The types of cancer that alpha interferons are used to treat include hairy cell leukemia, melanoma, follicular non-Hodgkin's lymphoma, and AIDS-related Kaposi's sarcoma.
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There are more sensory neurons in the tongue than in any other part of the body.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.