A half century after Jonas Salk first devised a vaccine for polio, nostalgic researchers at NYU Medical Center rediscovered the classic inoculation late Tuesday night, recreating the immunization treatment from a monkey kidney tissue culture determined to be highly evocative of the original. It was a simpler time back then, said project leader Dr. Timothy Riordan, who lamented his generation having lost touch with many traditions from the early days of virology. They just dont make vaccines like this anymore. There was a real craft to it back then. At press time, the scientists had shifted their efforts toward finding a way to contain the new deadly and virulent strain of polio they had inadvertently created. 