E=mc2 gives us the cosmological constant, which later was found to be the maximum speed at which light can travel. i also understand that when accelerating particles such as they do at CERN, it requires more and more energy the faster u want to go, the mass/speed issue. so i think i understand why photons can move at the speed of light while the rest of matter(for the most part) can't reach those speeds, photons have no mass while other particles do. I've also come across several articles claiming that they have, also at CERN, found neutrinos that may be moving faster than light can travel. my questions are; if both photons and neutrinos have no mass then thats not why photons cant reach the speeds of neutrinos. could it have something to do with matter interaction? also, now im no mathmatician, but if the c in e=mc2 was found to be the speed of light, and we know the equation holds true since its been put to the test countless times. why is it squared. whats the square doing to the speed of light?