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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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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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Cyanide works by making the human body unable to use oxygen.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.