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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Illicit drug use costs the United States approximately $181 billion every year.
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As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.
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The human body produces and destroys 15 million blood cells every second.
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Adolescents often feel clumsy during puberty because during this time of development, their hands and feet grow faster than their arms and legs do. The body is therefore out of proportion. One out of five adolescents actually experiences growing pains during this period.