weak nuclear force is only involved in changing a neutron to a proton and vice-versa, how does gravity explain that? you probably just remember that part of the theory incorrectly.

an interesting theory my chemistry teacher told us was that gravity does not exist, the effects of "gravity" is caused by charge of the atoms, the more there are the greater the charge, the greater the force towards it, but the electrons of the atoms shield a vast majority of the charge but charge is "emitted" radially and you can't expect the electrons to completely surround the nucleus due to the huge size difference (~1:1000?). and before you say anything about him as a teacher he did express that it was just his theory and he didn't teach it us as an official thing, so yeah. personally I like this better than the theory of gravitons and the higgs boson but we'll see if they find evidence of the higgs boson when the LHC finally comes full operational.

I saw that on wikipedia, that's probably the biggest problem with neutron armor. =__=