Scientist at UC Irvine just announced that they've discovered a fifth force of nature that rides on boson X. It runs the cosmos, along with the naughty four: gravitation, electromagnetism and the strong and weak nuclear forces. More research is needed to fully understand how the fifth works. Here's a brief summary of its significance:

This force is a sort of analogue to electromagnetism — except where electromagnetism acts on electrons and protons (and ignores neutrons), this fifth force works between electrons and neutrons (and ignores protons).