One Hundred Years of Quanta
Max Planck.
On 14 December 1900 Max Planck gave his seminal lecture to the German Physical Society, introducing the quantum concept for the first time. To join in the celebration of this crucial episode in the history of modern physics, we have invited two prominent historians of science who have studied the event, its origins and its implications. They will discuss, respectively, the related questions of Planck's original understanding of his idea and his fellow physicists' understanding of it once it had been introduced.