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Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
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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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Symptoms of kidney problems include a loss of appetite, back pain (which may be sudden and intense), chills, abdominal pain, fluid retention, nausea, the urge to urinate, vomiting, and fever.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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Asthma cases in Americans are about 75% higher today than they were in 1980.