Neutrino masses are extremely difficult to measure. While we know precisely how much an electron weighs, we have little information on the mass of its neutral partner, the electron neutrino. The same is true of the muon neutrino and tau neutrino.
As passengers boarded the train in a Berlin suburb, researchers from the Large Hadron Collider greeted them: Imagine you are a proton and this train is the LHC tunnel. You will travel 37 km, slightly more than the 27 km it takes the protons to circle the LHC tunnel.
At a recent symposium honoring former Stanford Linear Accelerator Center Director Jonathan Dorfan, dinner guests were treated to a course of the unexpected.