Para una versión en español, haga clic aquí. We can all tell that a lump of coal, a steel ball bearing and a lead brick are very different from one another, just by using our eyes. On the other hand, we know they are all just made up of different numbers of protons and neutrons in the nucleus, the atom’s inner core. At MINERvA we use neutrinos to see these materials, and sure enough, the protons and neutrons seem to…