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In 1864, the first barbiturate (barbituric acid) was synthesized.

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Medications that are definitely not safe to take when breastfeeding include radioactive drugs, antimetabolites, some cancer (chemotherapy) agents, bromocriptine, ergotamine, methotrexate, and cyclosporine.

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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.

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The horizontal fraction bar was introduced by the Arabs.

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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.

Animal extinctions and human population growth. Animal extinctions and human population growth.
Seasonal changes in biomass and growth form of benthic algae in the Eel River, California: (a) in ea Seasonal changes in biomass and growth form of benthic algae in the Eel River, California: (a) in ea
Growth hormone disorders. Illustration of a pituitary giant and a pituitary dwarf, both adults of ab Growth hormone disorders. Illustration of a pituitary giant and a pituitary dwarf, both adults of ab
Polyps and polyposis. A polyp is a protruding growth from a mucous membrane lining a hollow organ. I Polyps and polyposis. A polyp is a protruding growth from a mucous membrane lining a hollow organ. I
Growth in Closed Economies Growth in Closed Economies
Video: ADH and the arterioles, kidneys, sweat glands and the Atrial natriuretic peptide (ANP)

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