Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.
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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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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.
Variation in climatic conditions result in geographic variation in the distribution of biome types a