Light is electrons emitted by atoms for various reasons at various velocities which is visible to a subset of human beings. Infra-red and ultra-violet are radiations that are slower and faster than visible light.
Albert Eistein based his Theory of Relativity upon the axiomatic belief that the speed of light was constant, a simple error in armchair physics.
Magnetism is a phenomenon described by Sir William Gilbert, court physician to Queen Elizabeth I, which is nothing more than simple electrical polarization of an object and/or the electric field shape around a molecule.
The magnetism of the earth is most likely artificially caused by the transmission of electrons into the air from the Northern Hemisphere, near or at Great Britain.