In the early 1920s, physicists were first working out the mysteries of the quantum Universe. Particles sometimes behaved as waves, with indeterminate positions, momenta, energies, and other properties ...

In April 1932, six of the world's leading quantum physicists -- Niels Bohr, Paul Dirac, Paul Ehrenfest, Max Delbrück, Werner Heisenberg and Lise Meitner -- gathered at Bohr's Institute for Theoretical ...

Officials of the University of Leiden thought a series of long-ago visits by Albert Einstein had left them with nothing but nostalgia. For a period in the 1920s he would spend about a month each year ...

What makes something quantum? This question has kept a small but dedicated fraction of the world's population—most of them quantum physicists—up at night for decades. At very small scales, we know the ...

Tragic Fate of Physicist Paul Ehrenfest Paul Halpern, Starts with a Bang! February 11, 2015 Physics is not immune from tragedy. Even brilliant minds sometimes grapple with inner demons. The worst ...

Paul Ehrenfest was one of the most brilliant yet tragic figures in modern physics. A close friend and collaborator of Albert Einstein, he helped shape the foundations of quantum theory and statistical ...