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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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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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Thyroid conditions may make getting pregnant impossible.
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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.