Quantum mechanics was born 100 years ago. Physicists are celebrating
The International Year of Quantum marks a century of scientific developments

In 1927, physicists gathered to discuss the recent formulation of quantum mechanics, at the Solvay Conference on Physics in Brussels. Many important figures were in attendance, including Werner Heisenberg (back row, third from right) and Erwin Schrödinger (back row, sixth from right.) Albert Einstein is front row center.