Excerpts: Two ears of corn, two bushels of potatoes, two pigs, two calves, two chickens, two turkeys now grow where but one grew before. This has been achieved through the concerned work of many people in all walks of science and farming. Among the several scientific discoveries which substantially contributed to the abundant yields of our meat, egg and milk production was the astonishing discovery in the early 1950's of the "antibiotic growth effect" on livestock. It was at first unexpected, illogical, and baffling, but enormously exciting for it opened new vistas of research in animal science.