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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

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

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Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.

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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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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).

Political parties vs interest groups Political parties vs interest groups
David Claerbout, Sections of a Happy Moment. David Claerbout, Sections of a Happy Moment.
Visual aids, such as proper walking shoes and a pedometer, or an illustration showing someone ... Visual aids, such as proper walking shoes and a pedometer, or an illustration showing someone ...
The early development of the mammalian brain illustrated in schematic horizontal sections. Compare ... The early development of the mammalian brain illustrated in schematic horizontal sections. Compare ...
The 2-deoxyglucose technique. The accumulation of radioactivity is shown in three frontal sections ... The 2-deoxyglucose technique. The accumulation of radioactivity is shown in three frontal sections ...
Cross sections of the thigh Cross sections of the thigh
Video: Heart sounds

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