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Did you know?

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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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.

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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.

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To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.

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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").

Assessing for Bulge Sign, Milking the Patella Assessing for Bulge Sign, Milking the Patella
Photo of a sign taken at an emissions test facility. Photo of a sign taken at an emissions test facility.
Structure of the skin. Structure of the skin.
Uticaria, a skin rash caused by type I hypersensitivity. Uticaria, a skin rash caused by type I hypersensitivity.
Remove cold source, and check the knee for changes. Notice skin color and changes in swelling around ... Remove cold source, and check the knee for changes. Notice skin color and changes in swelling around ...
Annular lesions Annular lesions
Video: Phases of the Female Reproductive Cycle - Hormonal regulation

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