The coolest science conference of the 20th century was, hands down, the 1927 Solvay conference. Occurring during one of the most intense periods in the development of quantum mechanics, and attended by some of the most famous scientists in history, this meeting is especially well known for the sparring between Einstein and Bohr. The attendees included Ehrenfest, Schrödinger, Pauli, Heisenberg, Debye, Bragg, Dirac, Compton, de Broglie, Born, Bohr, Langmuir, Planck, Curie, Lorentz, Langevin, and Einstein. The classic, official conference photo has long circulated among science fans. Now, there's a movie version. Apparently Langmuir shot some home movie footage of the conference, which only surfaced recently. See if you can tell who is who: Read the feed: