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Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.
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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 1864, the first barbiturate (barbituric acid) was synthesized.
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There are 20 feet of blood vessels in each square inch of human skin.
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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.