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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
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There are 20 feet of blood vessels in each square inch of human skin.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.