Although it is arguably the most successful theory in physics, quantum physics has often baffled and confounded both its practitioners and the general public. This informative website discusses the types of mysteries, which still plague quantum physics, even after a century of rigorous development. These mysteries include the wave/particle duality of energy and matter; the fact that light quanta seem to know when they are being measured and react accordingly; and observations that some particles and atoms can apparently communicate faster than the speed of light, in blatant disregard of everything we've believed since Einstein.