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Did you know?
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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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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Blood is approximately twice as thick as water because of the cells and other components found in it.
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Illicit drug use costs the United States approximately $181 billion every year.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.