In 1920, the biologist
William Emerson Ritter invited Slosson to become the first head of
Science Service, which was being organized by Ritter and the newspaper publisher
E.W. Scripps with the aim of improving the general public's understanding of science by providing scientific news to daily newspapers. Slosson accepted Ritter's job offer, and in January 1921 he moved to
Washington, D.C., where Science Service's offices were located in the
National Research Council building. Slosson, whose official title at Science Service was Editor, was responsible for organizing and staffing the agency. His initial efforts were concentrated on promoting and developing
science journalism by the means of a weekly
syndicated news service called
Science News Bulletin. Slosson described Science Service as "a sort of liaison officer between scientific circles and the outside world".
Science News Bulletin was well received and in September 1922 it began to be issued to newspapers and magazines daily rather than weekly. Also in 1922,
Science Service started publishing
Science News Letter, a weekly magazine for sale to individuals.
Watson Davis, an engineer at the
National Bureau of Standards and part-time science journalist who had been submitting articles to
Science News Bulletin since it was established, became managing editor of Science Service in January 1923. Davis's assistance and the growing success of the agency allowed Slosson to devote more of his time to writing, lecturing and travelling. He contributed many articles to
Science News Letter and other magazines including
''Collier's Weekly, and published five more books during the last decade of his life. He made his first radio broadcast at a meeting of the
American Chemical Society in 1924, and in June of that year Science Service collaborated with the National Research Council to establish a weekly series called Science News of the Week''. These radio broadcasts featured scientists talking about their work. Slosson also travelled extensively as a news correspondent for Science Service, in 1923 joining an expedition by astronomers to
Mount Wilson Observatory in California to observe a
solar eclipse. When Slosson died of heart disease on October 15, 1929, in Washington, he was "easily the outstanding interpreter of sciences to the non-technical public", according to the
Dictionary of American Biography. ==References==