(1/3) Robert F. Furchgott - Born in Charleston, South Carolina, he earned his doctoral degree in biochemistry at Northwestern University in Illinois. His research led him to the discovery that the human body uses the gas nitric oxide (a poisonous gas that if released into the air can cause lung and skin problems) to relax blood vessels in muscles to let more blood flow. This discovery later led to the creation of the drug Viagra. For his work he received a portion of the Nobel Prize in Medicine in 1998. (1/3) Louis J. Ignarro - Born in Brooklyn, New York, he earned his doctoral degree in pharmacology from the University of Minnesota. His research led him to the discovery that the human body uses the gas nitric oxide (a poisonous gas that if released into the air can cause lung and skin problems) to relax blood vessels in muscles to let more blood flow. This discovery later led to the creation of the drug Viagra. For his work he received a portion of the Nobel Prize for Medicine in 1998. (1/3) Ferid Murad - Born in Whiting, Indiana, he earned his doctoral degree in pharmacology from Case Western Reserve University. After he completed his doctoral degree he wanted to study the effects of nitric oxide on chest problems. His research led him to the discovery that the human body uses the gas nitric oxide (a poisonous gas that if released into the air can cause lung and skin problems) to relax blood vessels in muscles to let more blood to flow. This discovery later lead to the creation of the drug Viagra. For his work he received a portion of the Nobel Prize for Medicine in 1998.