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If you could remove all of your skin, it would weigh up to 5 pounds.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
Illicit drug use costs the United States approximately $181 billion every year.
Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.
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.