11. Frederick Soddy rediscovered the equation in 1936. 12. It is named after Frederick Soddy ( 1877 1956 ), British radiochemist and physicist. 13. Frederick Soddy wrote to the British Colonial Office, recommending her for a government position. 14. He worked with Frederick Soddy as a researcher until interrupted by the First World War. 15. Soddy also extended the theorem to spheres; Thorold Gosset extended the theorem to arbitrary dimensions.16. It follows that it is tangent to infinitely many Soddy 's hexlet configurations of spheres. 17. Several generalizations of Steiner chains exist, most notably Soddy 's hexlet and Pappus chains. 18. Planetary atom and radioactivity which was the work of Rutherford, Kazimierz Fajans and Frederick Soddy . 19. Soddy asked Hitchins to investigate ionium.20. The first stanza describes Soddy 's circles, whereas the second stanza gives Descartes'theorem.