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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.
Did you know?
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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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.
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Illicit drug use costs the United States approximately $181 billion every year.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.