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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.

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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.

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There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).

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The newest statin drug, rosuvastatin, has been called a superstatin because it appears to reduce LDL cholesterol to a greater degree than the other approved statin drugs.

A 19-foot-long blue whale skull in the collections of the Smithsonian Museum of Natural History A 19-foot-long blue whale skull in the collections of the Smithsonian Museum of Natural History
Grevy's zebras in Samburu National Reserve. Grevy's zebras in Samburu National Reserve.
William Kentridge, History of the Main Complaint. William Kentridge, History of the Main Complaint.
History History
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