Great question and it’s one that we’re working to try to understand!
The theory is that at some higher energy scale all the different forces might actually have been the same thing, then they break away from one another until you get down to our energy scale where they all appear to be different. It’s a neat theory but we don’t know what that energy scale is, and we don’t have evidence that this is true!
The LHC will go a long way to helping us understand, though!
I dont actually know, so great question! The amazing thing about gravity is that even though it is so small it is really powerful in terms of the fact that it is accountable, in a way, for the reason we are here! without gravity earth wouldnt orbit the sun and we wouldnt be here!!
Hmmm…very good question! Perhaps it has something to do with the exchange particles that mediate the interactions – can’t tell you anything more than that I’m afraid!
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