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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.

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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.

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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.

The anterior pituitary is sometimes called the master gland because it secretes many hormones that r The anterior pituitary is sometimes called the master gland because it secretes many hormones that r
Helping maintain accurate patient records is a critical part of the medical assistant's work. Helping maintain accurate patient records is a critical part of the medical assistant's work.
The cultural and racial–ethnic diversity of today’s work force has led to the need for diversity ... The cultural and racial–ethnic diversity of today’s work force has led to the need for diversity ...
With tough economic times, a lot of people have lost their jobs—and their homes. If this happens, ... With tough economic times, a lot of people have lost their jobs—and their homes. If this happens, ...
Location of the main structures of the vessels Location of the main structures of the vessels
A system absorbs 623 J of heat while doing 457 J of work. What is the value of U? A system absorbs 623 J of heat while doing 457 J of work. What is the value of U?
Video: Cognitive development by Piaget (Preoperational stage or intelligence)

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