In stenger's book he claims that the ratio between gravity and the electro magnetic is not 1039 Let me know if you think he's right Note that N1 (ratio of EM force to gravity) is not a universal number; it depends on the charges and masses of the bodies you use in the calculation. For an electron and proton the ratio is the famous 1039 that I will continue to call N1. But why assume these two particles in defining N1? The proton is not even fundamental. It is made of quarks. For two electrons, the ratio is 1047. If we have two unit-charged particles of equal mass 1.85 x 10-9 kilograms, N1 = 1 and the two forces would be equal! If we were to ask what mass is the most fundamental, it would be the Planck mass, which is formed from the fundamental constants and equals 2.18 x 10-8 kg. The gravitational force between two particles, each with the Planck mass and unit electric charge, is 137 times stronger than the electric force!