Einstein's theories describe the large scale structure of space and time. Quantum theory describes the small scale behaviour of matter within space and time: the behaviour of molecules, atoms and other particles. The mysteries of quantum theory were dramatized by a series of paradoxes, but the theory worked very well and never threatened to contradict and overthrow its rival. The theories of classical physics worked well at low speeds but failed for objects travelling near the speed of light. The EPR experiments have momentous implications for the interpretation of relativity theory. In short, they favour Lorentz's minority interpretation. The experiments that directly threaten Einstein's celestial speed limit involve measurements on pairs of particles some distance from each other. Einstein saw that quantum theory implied faster than light signals and therefore was in conflict with relativity, but he concluded there must be some flaw in quantum theory.