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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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There are approximately 3 million unintended pregnancies in the United States each year.
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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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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.