There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Drug-induced pharmacodynamic effects manifested in older adults include drug-induced renal toxicity, which can be a major factor when these adults are experiencing other kidney problems.
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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).