From PhysicsCakes https://twitter.com/PhysicsCakes on Twitter: Sean explores door number 4 of the #CERNCorridorCupboardAdventCalendar. Did Susan and Klaus ever finish the neutrino book??? I guess well just have to add this to our list of mysteries of the universe we want to uncover here at @CERN! https://twitter.com/PhysicsCakes/status/1202132076864114689/video/1 https://chirp.cooleysekula.net/attachment/62442