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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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Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.

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Carbamazepine can interfere with the results of home pregnancy tests. If you are taking carbamazepine, do not try to test for pregnancy at home.

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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.

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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.

The visual field as seen by a person with (a) glaucoma, (b) macular degeneration, and (c) cataracts. The visual field as seen by a person with (a) glaucoma, (b) macular degeneration, and (c) cataracts.
A person with a defective "P" gene might only have it effect the EYES A person with a defective "P" gene might only have it effect the EYES
Mean scores for Erikson’s stage V (Identity) for two cohorts. Scores for both cohorts increase ... Mean scores for Erikson’s stage V (Identity) for two cohorts. Scores for both cohorts increase ...
Major “identity elements” in some tRNAs Major “identity elements” in some tRNAs
A Breathalyzer is used to measure a person's blood alcohol concentration (BAC) A Breathalyzer is used to measure a person's blood alcohol concentration (BAC)
Gender and Play in Children (1 of 2) Gender and Play in Children (1 of 2)
Video: Neural regulation of blood pressure - baroreceptor and chemoreceptor reflexes

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