October birthdays in quantum physics: Clinton Davisson and Lester Germer, who showed in 1927 that electrons diffract like waves, plus Niels Bohr and Felix Bloch. Also born in October: Chandrasekhar, C.N. Yang, Ginzburg, Gianotti and Sean Carroll. πŸ“· πŸ“· πŸ“· πŸ“·