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Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.
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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 more sensory neurons in the tongue than in any other part of the body.
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The average office desk has 400 times more bacteria on it than a toilet.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.