But physics doesn't answer this kind of question. We don't know why magnetism, for example, works the way it does - we just measure it's effects and model it wi

But physics doesn't answer this kind of question. We don't know why magnetism, for example, works the way it does - we just measure it's effects and model it with mathematics. OTOH I think it's interesting to imagine universes with stronger or weaker gravity, and to realize that in most of them it's hard to imagine life being possible at all. (Life would not arise without gravity (since you need to smush matter together to get life) but it also wouldn't arise with super strong gravity (since life needs to be able to move around).)