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Blood is approximately twice as thick as water because of the cells and other components found in it.

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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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Symptoms of kidney problems include a loss of appetite, back pain (which may be sudden and intense), chills, abdominal pain, fluid retention, nausea, the urge to urinate, vomiting, and fever.

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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.

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

Large numbers of plant species can flower at once in this grassland in Kinsella, Alberta. Large numbers of plant species can flower at once in this grassland in Kinsella, Alberta.
(a) Feeding by bear on salmon results in large allochthonous inputs of nutrients into (b) the forest (a) Feeding by bear on salmon results in large allochthonous inputs of nutrients into (b) the forest
Pekingese's large eyes Pekingese's large eyes
Welcome sign for Kenton, Tennessee, an example of competition for "White Squirrel Capital" Welcome sign for Kenton, Tennessee, an example of competition for "White Squirrel Capital"
Large intestine. Large intestine.
Greek Letter psi Greek Letter psi
Video: ATPase function - membrane transport, contractile proteins and synthesis

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