Tragically, in 1906, Boltzmann committed suicide and many believe that the statistical mechanics was the cause. He provided the current definition of entropy, interpreted as a measure of statistical disorder of a system His student, Paul Ehrenfest, carrying on Boltzmann's work, died similarly in 1933. William James, in 1909, found dead in his room probably due to suicide. Bridgman, the statistical physics pioneer, committed suicide in 1961. Gilbert Lewis, took cyanide in 1987after not getting a Nobel prize.