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Did you know?

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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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.

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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.

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The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.

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Video: Hormonal regulation of pregnancy - weeks 17 through 38

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