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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.

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Approximately 500,000 babies are born each year in the United States to teenage mothers.

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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.

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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.

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Adolescents often feel clumsy during puberty because during this time of development, their hands and feet grow faster than their arms and legs do. The body is therefore out of proportion. One out of five adolescents actually experiences growing pains during this period.

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