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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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The longest a person has survived after a heart transplant is 24 years.
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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.