The header image is from Fifth Solvay Conference held in 1927 where the world’s most prominent physicists met to discuss the newly formulated quantum theory. How many of them can you recognize? Starting from the third row in the order they are sitting from left to right.

Third Row: A. Picard, E. Henriot, P. Ehrehnfest, Ed. Hersen, Th. De Donder, E. Schrödinger, E. Verschaffelt, W. Pauli, W. Heisenberg, R. H. Fowler, L. Brillouin

Second Row: P. Debye, M. Knudsen, W. L. Bragg, H. A. Kramers, P.A.M. Dirac, A. H. Compton, L. de Broglie, M. Born, N. Bohr

First Row: I. Langmuir, M. Planck, Mme (the French abbreviation for Madame) Curie, H. A. Lorentz, A. Einstein, P. Langevin, Ch. E. Guye, C.T.R. Wilson, O. W. Richardson