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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.
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The longest a person has survived after a heart transplant is 24 years.
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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.