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The familiar sounds of your heart are made by the heart's valves as they open and close.

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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

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Cutaneous mucormycosis is a rare fungal infection that has been fatal in at least 29% of cases, and in as many as 83% of cases, depending on the patient's health prior to infection. It has occurred often after natural disasters such as tornados, and early treatment is essential.

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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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Illicit drug use costs the United States approximately $181 billion every year.

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