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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

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Glaucoma is a leading cause of blindness. As of yet, there is no cure. Everyone is at risk, and there may be no warning signs. It is six to eight times more common in African Americans than in whites. The best and most effective way to detect glaucoma is to receive a dilated eye examination.

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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

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Computer programs are available that crosscheck a new drug's possible trade name with all other trade names currently available. These programs detect dangerous similarities between names and alert the manufacturer of the drug.

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About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.

Phosphatidylcholine, a typical phosphoglyceride Phosphatidylcholine, a typical phosphoglyceride
A typical pop tester used to check the spray pattern of a diesel engine injector. A typical pop tester used to check the spray pattern of a diesel engine injector.
A typical magnetic crankshaft position sensor. A typical magnetic crankshaft position sensor.
A typical ECT sensor temperature versus voltage curve. A typical ECT sensor temperature versus voltage curve.
DNA sequence variation in parts of the Drosophila Adh gene DNA sequence variation in parts of the Drosophila Adh gene
phylogenetic results using the TCF7L2 transcripting mRNA sequence for the 4 listed taxa phylogenetic results using the TCF7L2 transcripting mRNA sequence for the 4 listed taxa
Video: Major Elements in Biological Molecules: Carbohydrates

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