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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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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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To combat osteoporosis, changes in lifestyle and diet are recommended. At-risk patients should include 1,200 to 1,500 mg of calcium daily either via dietary means or with supplements.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.