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Did you know?

A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.

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Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.

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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").

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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.

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Anesthesia awareness is a potentially disturbing adverse effect wherein patients who have been paralyzed with muscle relaxants may awaken. They may be aware of their surroundings but unable to communicate or move. Neurologic monitoring equipment that helps to more closely check the patient's anesthesia stages is now available to avoid the occurrence of anesthesia awareness.

Sexual dimorphism in body size and mating system. Sexual dimorphism in body size and mating system.
Sexual Maturation Sexual Maturation
This painting depicts New Orleans in 1803, when the city was acquired—along with much of the modern This painting depicts New Orleans in 1803, when the city was acquired—along with much of the modern
The experience of romantic attachments is similar among sexual majority and minority youth. The experience of romantic attachments is similar among sexual majority and minority youth.
Measuring Apical–Radial Pulse (Two Persons) Measuring Apical–Radial Pulse (Two Persons)
Sexual Scripts Sexual Scripts
Video: Blood Flow through the Human Heart

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