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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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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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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.