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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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.
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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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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
Female nursing cub, Amboseli National Park, Kenya
Should we restore YellowstoneNationalPark, as our flagship National Park, to include the natural ...