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In 1864, the first barbiturate (barbituric acid) was synthesized.
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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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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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There are 20 feet of blood vessels in each square inch of human skin.
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The familiar sounds of your heart are made by the heart's valves as they open and close.