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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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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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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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Everyone has one nostril that is larger than the other.
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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.