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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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Blood is approximately twice as thick as water because of the cells and other components found in it.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.
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Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.