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Did you know?

Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.

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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.

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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

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Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.

Because the leg muscles of children with muscular dystrophy are weak, they must perform the Gowers’ Because the leg muscles of children with muscular dystrophy are weak, they must perform the Gowers’
Patient's forearm supported in bed Patient's forearm supported in bed
Many thought ideological politics was over in the United States, but 2012 showed strong ideological Many thought ideological politics was over in the United States, but 2012 showed strong ideological
Targeting female fetuses for abortion has become a main issue of the emerging feminist movement in ... Targeting female fetuses for abortion has become a main issue of the emerging feminist movement in ...
Ozone Depletion—A Global Issue Ozone Depletion—A Global Issue
Prone position. Placement of bolsters under ankles and shoulders, head supported by face cradle. Prone position. Placement of bolsters under ankles and shoulders, head supported by face cradle.
Video: Miller's reaction chamber experiment Animation

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