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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.

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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.

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Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.

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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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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

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