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Did you know?

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

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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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Anti-aging claims should not ever be believed. There is no supplement, medication, or any other substance that has been proven to slow or stop the aging process.

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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.

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Hip fractures are the most serious consequences of osteoporosis. The incidence of hip fractures increases with each decade among patients in their 60s to patients in their 90s for both women and men of all populations. Men and women older than 80 years of age show the highest incidence of hip fractures.

Retinopathy. Illustration of a normal retina (left) and a diseased retina (right). The diseased reti Retinopathy. Illustration of a normal retina (left) and a diseased retina (right). The diseased reti
Symbolic language may have helped reinforce exclusive sexual relationships within social groups in l Symbolic language may have helped reinforce exclusive sexual relationships within social groups in l
Men’s work? Women’s work? Customs in other societies can blow away stereotypes. As is common ... Men’s work? Women’s work? Customs in other societies can blow away stereotypes. As is common ...
The evolution of societies has been so thorough that this scene—once common for all humanity—has ... The evolution of societies has been so thorough that this scene—once common for all humanity—has ...
Video: Heart Chambers

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