RT @newscientist
An experiment that probed particles called gluons, which contain most of the mass of a proton, has revealed that a proton’s radius alters depending on whether you look at the particle's charge or mass https://www.newscientist.com/article/2366932-protons-seem-to-be-a-different-size-depending-on-how-you-look-at-them/#Echobox=1681410623