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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Cyanide works by making the human body unable to use oxygen.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.