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Did you know?
There are 60,000 miles of blood vessels in every adult human.
Did you know?
People about to have surgery must tell their health care providers about all supplements they take.
Did you know?
Approximately 500,000 babies are born each year in the United States to teenage mothers.
Did you know?
Your heart beats over 36 million times a year.
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.