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His work on crowd psychology became important during the first half of the twentieth century when it was used by media researchers such as Hadley Cantril and Herbert Blumer to describe the reactions of subordinate groups to media. He also contributed to controversy about the nature of matter and energy. His book The Evolution of Matter was very popular in France (having twelve editions), and though some of its ideas—notably that all matter was inherently unstable and was constantly and slowly transforming into luminiferous ether—were used by some physicists of the time (including Henri Poincaré), his specific formulations were not given much consideration. In 1896 he reported observing a new kind of radiation, which he termed "black light" (not the same as what modern people call bla...