|
|
Approximately 500,000 babies are born each year in the United States to teenage mothers.
This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
On average, the stomach produces 2 L of hydrochloric acid per day.
Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.
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.