I'm no expert in this stuff, it's just a hobby to me, but I've been reading up on the WIMP theory a bit - layman articles, not published research.
From Wiki on Dark Matter:
It also cannot interact with ordinary matter via electromagnetic forces; in particular, dark matter particles do not carry any electric charge.
But what I've read on WIMP theory is that WIMPs could be made up of Strange Quarks and Neutrons - maybe that's just a theory, not "the theory", but here's my question. Since Strange Quarks have charge, wouldn't WIMPs probobly have charge? and if they don't, what balances out the charge?
Also, and I'm not sure this can be answered in Layman words, but what exactly happens when a particle interacts with Electromagnetic forces. Forget normal matter, lets go back to the early universe when most of the dark matter probobly formed, and there's lots of angry photos flying around and the universe is a bunch of particles - lose protons, neutrons, electrons and stuff. light, as I understand it, passes through dark matter but not lose protons or Neutrons - cause at the time, the universe was opaque. - what exactly happens when a photon hits a proton or an electron that theoretically doesn't happen when the light hits dark matter. I understand what happens when light hits hydrogen for example, well enough, it either passes through or it shoots the electron to a higher orbit.