Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.
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Cucumber slices relieve headaches by tightening blood vessels, reducing blood flow to the area, and relieving pressure.
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Cyanide works by making the human body unable to use oxygen.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
Far Oceania was the last of the regions of the world to be colonized by humans.
World Religions
World Crude Oil Production and Reserves (Billions of Barrels)