You probably mean the Solvay conference. I just wanted to append this link to your comment: https://upload.wikimedia.org/wikipedia/commons/thumb/6/6e/Solvay_con

You probably mean the Solvay conference. I just wanted to append this link to your comment: https://upload.wikimedia.org/wikipedia/commons/thumb/6/6e/Solvay_conference_1927.jpg/1920px-Solvay_conference_1927.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/6/6e/So... It really is a remarkable picture, but I'd like to note that it's all physicists, not scientists in general. It was the golden era of physics.