E=mc^2 is BS. Scientists don't know exactly what energy is yet. The ability to do work is their best description of energy. Energy has nothing to do with light speed. The light must coexist with its carrier/medium/matter. Light is oscillating electricity carried by oscillating atoms at visible frequency. Light induces light simultaneously throughout space due to the universal repulsion force. Light speed is the electricity moving rate in the medium. There is no light traveling in the vacuum space. All you know about light is a mistake. All scientists are wrong about light.