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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Russia has the highest death rate from cardiovascular disease followed by the Ukraine, Romania, Hungary, and Poland.
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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.