A supporter of free state status for Kansas, he helped to organize a branch of the Underground Railroad and ran a "station" where escaping slaves were sheltered.

[3] After obtaining a Bachelor of Science degree in 1890, he remained at the University of Kansas as a graduate student, studying chemistry, physics, geology and psychology.

His observations on these and other subjects, including food adulteration and the fuel value of prepared cereals, were published in numerous bulletins of the Experiment Station.

After his doctoral studies, he spent the summer of 1903 in New York, working as an unpaid assistant to Hamilton Holt, the magazine's editor and publisher.

[10] 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.

[12]Science News Bulletin was well received and in September 1922 it began to be issued to newspapers and magazines daily rather than weekly.

[11] Davis's assistance and the growing success of the agency allowed Slosson to devote more of his time to writing, lecturing and travelling.

[1] 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.

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.

[11] 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.