Viagra
Inventors: Scientists at Pfizer
Year: 1992
What Happened: A Welsh hamlet was ground zero for a test on a pill to fight angina. Unfortunately for the afflicted, it had little success against the disease.
Big Discovery: Though it didn’t work, the men taking part in the study refused to give up their medicine.
As a Result: The scientists switched gears and marketed the drug, Viagra, for a very different purpose.