pushing singlehandedly, and it wasn't just seat belts but everything from safety glass to airbags:
"Nader's advocacy of automobile safety and the publicity generated by the publication of Unsafe at Any Speed, along with concern over escalating nationwide traffic fatalities, led to the unanimous passage of the 1966 National Traffic and Motor Vehicle Safety Act. The Act established the National Highway Traffic Safety Administration, and marked an historic shift in responsibility for automobile safety from the consumer to the manufacturer. The legislation mandated a series of safety features for automobiles, beginning with safety belts and stronger windshields."
http://en.wikipedia.org/wiki/Ralph_Nader"Salk's so-called "killed" vaccine was tested and released for use in 1955 . It was effective in preventing most of the complications of polio, but did not prevent the initial, intestinal, infection from occurring. Sabin's "live" virus vaccine began international testing through the World Health Organization in 1957 when large groups of children in Russia, Holland, Mexico, Chile, Sweden and Japan received it."
http://en.wikipedia.org/wiki/Albert_SabinWhoops! Try again yourself!