Physicists finally nail the proton’s size, eliminating an anomaly
I wish a physicist could explain here how the very notion of "diameter" has any meaning for an object whose size (IIUC) belong entirely to the quantum realm.<p>Is the hydrogen atom two hard little balls of matter orbiting one another, as we were taught in primary school, or are they a probabilistic soup with various, vaguely localized extrema?<p>If the latter, how do you even define the notion of diameter?