General discussion Por Scholz, F, Eisenthal, K, Bain, C, Rusling, J, Lynden-Bell, R, Leermakers, F, Rathman, J, Walker, R, Cicuta, P, Samec, Z, Schlossman, M, Kornyshev, A, Urbakh, M, Wennerström, H, Dagastine, R, Deutsch, M, Penfold, J, Oldfield, C, Clarke, S, Clegg, P