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Did you know?

The average human gut is home to perhaps 500 to 1,000 different species of bacteria.

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Elderly adults are at greatest risk of stroke and myocardial infarction and have the most to gain from prophylaxis. Patients ages 60 to 80 years with blood pressures above 160/90 mm Hg should benefit from antihypertensive treatment.

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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

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Vaccines prevent between 2.5 and 4 million deaths every year.

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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).

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Video: Hormonal regulation of pregnancy - weeks 17 through 38

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