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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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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.

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Excessive alcohol use costs the country approximately $235 billion every year.

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The newest statin drug, rosuvastatin, has been called a superstatin because it appears to reduce LDL cholesterol to a greater degree than the other approved statin drugs.

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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.

Typical keyboard layout. Typical keyboard layout.
A typical eye wash station. A thorough flushing of the eyes with water is the first and often the ... A typical eye wash station. A thorough flushing of the eyes with water is the first and often the ...
The sensing wire in a typical hot wire mass air flow sensor. The sensing wire in a typical hot wire mass air flow sensor.
A typical electric motor-driven AIR pump. This unit is on a Chevrolet Corvette and only works when ... A typical electric motor-driven AIR pump. This unit is on a Chevrolet Corvette and only works when ...
The anatomy of a typical synapse. The anatomy of a typical synapse.
First-degree burn. First-degree burn.
Video: How a Urinalysis is Performed

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