We know that we live in an expanding and changing universe, but neverthelesswe prefer some solid foundations upon which to base our reasoning. This idea isreflected in the introduction of quantities that we call the “fundamental phys-ical constants”. These constants do, as John D. Barrow said, “capture at onceour greatest knowledge and our greatest ignorance about the universe”. The in-terrelations between them give us hints where to look for underlying commonfoundations of phenomena that are observed in different branches of physics.At the same time, we also call these quantities “fundamental” because we havenot so far been able to deduce their numerical values from a deeper level ofunderstanding