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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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There are 20 feet of blood vessels in each square inch of human skin.

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The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.

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Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.

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Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).

Body cavities. (A) Lateral view of a sagittal section through the body. (B) Anterior view of a front Body cavities. (A) Lateral view of a sagittal section through the body. (B) Anterior view of a front
When the White House tapes were turned over to the special prosecutor, several crucial sections had ... When the White House tapes were turned over to the special prosecutor, several crucial sections had ...
As with other groups, there is no such thing as the Latino family. Some Latino families speak little ... As with other groups, there is no such thing as the Latino family. Some Latino families speak little ...
In situ hybridization. This color-coded frontal section through a rat brain reveals high ... In situ hybridization. This color-coded frontal section through a rat brain reveals high ...
Frontal lifting Frontal lifting
Observing transillumination of the frontal sinuses Observing transillumination of the frontal sinuses
Video: Metaphase I Animation

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