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Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.
Did you know?
Asthma cases in Americans are about 75% higher today than they were in 1980.
Did you know?
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.
Did you know?
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
Did you know?
The FDA recognizes 118 routes of administration.