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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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There are 60,000 miles of blood vessels in every adult human.
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The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.