Matter composed of protons, neutrons and electrons. This is the stuff that you and I, and everything else we see on the earth is composed of. As opposed to the supposed massive particles that interact weakly with the rest of matter, everything from heavy neutrinos, called neutralinos, to photinos or axions. Taken together these other particles are called WIMPs or weakly interacting massive particles.

Source:
http://www.sciforums.com/showthread.php?s=958769a6b30ca834c37bcda0d8644408&threadid=2758

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