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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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There are approximately 3 million unintended pregnancies in the United States each year.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.
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The horizontal fraction bar was introduced by the Arabs.