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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
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.