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The longest a person has survived after a heart transplant is 24 years.
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The human body produces and destroys 15 million blood cells every second.
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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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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.