sentences:  During the 1934-1935 academic year, Eckart took a sabbatical at the Institute for Advanced Study in New Jersey, as he also did in the academic years 1952-1953 and 1960-1961.During this period he published, along with Gale Young, a proof of the Eckart-Young theorem, which solves the problem of least-squares approximation of a given matrix by a matrix of lower rank.In December 1938 in Germany, Otto Hahn and Fritz Strassmann conducted an experiment which pointed towards the fission of uranium.