Medicine.
	Albert Bruce Sabin was influenced to study polio by an epidemic of that disease that hit New York City in 1931. He began testing a live-virus vaccine in 1954, and by the 1970's that vaccine had succeeded in nearly eradicating polio from the world. Klinefelter Syndrome describes a group of symptoms found in some men with an extra X chromosome. Every man who exhibits symptoms of Klinefelter Syndrome has an extra X chromosome, but not every male who has the extra chromosome exhibits symptoms.   William Thomas Green Morton On September 30, 1846, Morton used sulfuric ether to remove an ulcerated tooth from a patient who reportedly experienced no pain during the procedure.