Physicists have resolved the mystery of the size of the proton in relation to conflicting measurements over the past 15 years. The latest experimental measurements, published in the journals Nature and Physical Review Letters, suggest a smaller proton radius than predicted and suggest exciting new physics. The study was co-authored by Lothar Maisenbacher from the University of California, Berkeley, who believes this is the "final nail in the coffin of theproton radius puzzle". The proton, which is made up of three charged quarks bound together by the strong nuclear force, can be found anywhere in a fuzzy orbit-like pattern that scientists use to determine its position.