What Would Happen If...

We use 4 space-time dimensions, 4 basic algebraic operations, 4 common particles (photon, proton + 2 quarks), 4 forces and so on. What is the favorite number in the bible? 7. If I've had a time machine, I would like to travel back in time and change it to 4, to increase the chance for humanity to discover the laws of physics at an earlier point, just think of it, billions of people interested in science, preaching it every Sunday. Perhaps there is a universe out there... it would be like heaven.