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Coca-Cola originally used coca leaves and caffeine from the African kola nut. It was advertised as a therapeutic agent and "pickerupper." Eventually, its formulation was changed, and the coca leaves were removed because of the effects of regulation on cocaine-related products.

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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.

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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.

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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.

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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.

Pierolapithecus catalunicus may be an ancestor of great apes and humans. Its postcranial skeleton sh Pierolapithecus catalunicus may be an ancestor of great apes and humans. Its postcranial skeleton sh
(a) The Dmanisi cranium (right) shows similarities to early African H. erectus including the Narioko (a) The Dmanisi cranium (right) shows similarities to early African H. erectus including the Narioko
This chart shows the various lines of responsibility and how they differ in presidential and parliam This chart shows the various lines of responsibility and how they differ in presidential and parliam
This frame from a home video shows Eric Harris (on the left) and Dylan Klebold (on the right) as ... This frame from a home video shows Eric Harris (on the left) and Dylan Klebold (on the right) as ...
The three-way catalytic converter first separates the NOX into nitrogen and oxygen and then ... The three-way catalytic converter first separates the NOX into nitrogen and oxygen and then ...
A phylogenetic tree showing the evolutionary relationships among hominoids. The evidence shows that A phylogenetic tree showing the evolutionary relationships among hominoids. The evidence shows that
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