The National Center for Complementary and Integrative Health lists orgone as a type of "putative energy".[15] After Reich's death, research into the concept of orgone passed to some of his students such as Kelley and later to a new generation of scientists in Germany keen to discover an empirical basis for the orgone hypothesis, (the first positive results of which were provided in 1989 by Stefan Muschenich).[16] There is no empirical support for the concept of orgone in medicine or the physical sciences,[3] and research into the concept ceased with the end of the Institute.