justthinkit writes: "Live Science reports on the findings of researchers from Amherst College and the University of Texas at Austin that speculate there might be "a new fundamental force of nature". Having alleged long-range effects it may turn out to be electromagnetism in disguise. Still, the prospects are interesting. Thus far there are 3 possible explanations, including an "unparticle" and a Z' (pronounced "Z-prime"). Does anyone have a simple(r) explanation of the "long-range spin-spin interaction" observed?"