All Subjects
      All Types

        Info

        Grades

        1-12

        Permitted Use

        Stream, Download, Share, and Modify


        6 Favorites
        54 Views

        Salk At Work | Famous Scientists

        Dr Jonas Salk, who discovered the first vaccine against poliomyelitis, at work in the Virus Research Laboratory at the University of Pittsburgh Medical School. (Photo by Keystone Features/Getty Images)

        You must be logged in to use this feature

        Need an account?
        Register Now