The emergence of quantum mechanics a century ago

Lucy Mensing, a founding member of the ‘Interdisciplinary Group on Heligoland’, worked out some of the first applications of his quantum-mechanical theory in the 1970s, Daniela Monaldi, a historian at York University in Toronto, Canada said. Heisenberg had developed a theory of motion in which electrons could no longer be thought of as particles that move along continuous trajectories.