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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.

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Human kidneys will clean about 1 million gallons of blood in an average lifetime.

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As many as 20% of Americans have been infected by the fungus known as Histoplasmosis. While most people are asymptomatic or only have slight symptoms, infection can progress to a rapid and potentially fatal superinfection.

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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.

The path of light through the cornea, iris, lens, and striking the retina. The path of light through the cornea, iris, lens, and striking the retina.
Hyperopia (farsightedness). In the uncorrected top figure, the image would come into focus behind th Hyperopia (farsightedness). In the uncorrected top figure, the image would come into focus behind th
Severe contact dermatitis. Severe contact dermatitis.
Lens Lens
Spherical Aberration Spherical Aberration
Contact dermatitis resulting from poison ivy. Contact dermatitis resulting from poison ivy.
Video: Oxygen transport: association and dissociation & Factors that affect hemoglobin's saturation with O2

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