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.
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Street names for barbiturates include reds, red devils, yellow jackets, blue heavens, Christmas trees, and rainbows. They are commonly referred to as downers.
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Although the Roman numeral for the number 4 has always been taught to have been "IV," according to historians, the ancient Romans probably used "IIII" most of the time. This is partially backed up by the fact that early grandfather clocks displayed IIII for the number 4 instead of IV. Early clockmakers apparently thought that the IIII balanced out the VIII (used for the number 8) on the clock face and that it just looked better.
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The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.
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Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.
A typical eukaryotic cell.
Typical hand deformities associated with rheumatoid arthritis.
A schematic of a typical glow plug circuit. Notice that the relay for the glow plug and intake air ...
A typical ball-peen hammer.
A typical 1/2 inch drive air impact wrench. The direction of rotation can be changed to loosen or ...
Writers, readers, and erasers of the CTD phosphorylation code