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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 actually 60 minerals, 16 vitamins, 12 essential amino acids, and three essential fatty acids that your body needs every day.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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.