Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Limit intake of red meat and dairy products made with whole milk. Choose skim milk, low-fat or fat-free dairy products. Limit fried food. Use healthy oils when cooking.
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Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.
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There are 20 feet of blood vessels in each square inch of human skin.
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Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.
Three principle forms of natural selection: (a) stabilizing selection, (b) directional selection, an
California ground squirrel (Spermophilus beecheyi) in the man-made rocky shoreline of the Berkeley M
Variation in coat pattern in zebras. The patterns show progressively more black left to right and to
These illustrations show Ellen Craft, a slave with and without a disguise. She dressed “as a disting
When Union troops pushed toward Richmond in June of 1862, these slaves crossed the Rappahannock Rive