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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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People about to have surgery must tell their health care providers about all supplements they take.
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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.
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Most women experience menopause in their 50s. However, in 1994, an Italian woman gave birth to a baby boy when she was 61 years old.
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Blood is approximately twice as thick as water because of the cells and other components found in it.