So some questions have been made around why does the speed of light have to be the cosmic speed limit. well to answer this, any object with zero rest mass moves at c (read more about invariant mass for details). but here's another question: Mass has always been referred to as positive like +2 kg or +3 kg since after all what can weigh less than nothing, but what happens if something does? some thing like Anti-mass. so if something weighs -1kg then if we complete the equation E=mc2 then we should get -1x300,000,000 x 300,000,000 which is -90 000 000 000. this means two things: firstly, there is negative energy which i have no idea does. secondly, this might be able to move faster than the cosmic speed limit. What do you think?