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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

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The toxic levels for lithium carbonate are close to the therapeutic levels. Signs of toxicity include fine hand tremor, polyuria, mild thirst, nausea, general discomfort, diarrhea, vomiting, drowsiness, muscular weakness, lack of coordination, ataxia, giddiness, tinnitus, and blurred vision.

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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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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.

Experimental evidence of the effect of allelochemicals on plant production. Experimental evidence of the effect of allelochemicals on plant production.
Oil and Natural Gas Production from More Wells in Smaller Areas Oil and Natural Gas Production from More Wells in Smaller Areas
The proportion of adults 55 to 64 in the labor force in Germany, Italy, and France is low and has ... The proportion of adults 55 to 64 in the labor force in Germany, Italy, and France is low and has ...
Energy Resources range from inexhaustible to nonrenewable Energy Resources range from inexhaustible to nonrenewable
Capital-Biased Technological Change Capital-Biased Technological Change
Complete the following production chart and plot the points. Complete the following production chart and plot the points.
Video: Cellular Defects - Osteoblasts, Osteoclasts and Osteocytes

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