Dear cosmologists, how do we know the total electric charge of the Universe ? For instance the matter-antimatter asymmetry was a part in (say) 10 billions. But gravity is 40 order of magnitude less intense than electromagnetism, so I need an asymmetry 30 orders of magnitude less for electrical repulsion to just balance gravitational attraction. Even if we now have the same number of protons and electrons, there is no measurement (say) 50 significant digits for the equality of their charge. If their electric charge would differ by such a tiny amount, would not I expect 10% deviation in the global expansion rate ?