I was delighted to read last week that a physics group at the CERN Supercollider discovered an antimatter hydrogen atom – a positron bound to an antiproton. I wrote on this prediction from General Relativity in my last three books: Concepts of Modern Physics: The Haifa Lectures (Imperial College Press, 2007), p. 104; Quantum Mechanics and Gravity (Springer, 2004), p. 171 and Physics of the Universe (Imperial College Press, 2010), p. 56, as well as my article: "On the Separation of Matter and Antimatter in the Early Universe", Annales de la Fondation Louis de Broglie 20, 323 (1995). The scenario for the separation of matter and antimatter is as follows: Tne prediction for cosmology from GR is an oscillating universe, between expansion and contraction, that entails a spiral configuration. All visible matter is embedded in a dense sea of particle-antiparticle pairs, bound in a state that is at zero energy (2mc^2 units of energy below the state where the particle and antiparticle would be free of each other). These pairs (electron-positron and proton-antiproton) are the dark matter. It entails that at each 'big bang' – just after the beginning of an expansion phase of the universe, many of these pairs are ionized by the gravitational field of the maximally dense universe. The separated particle and antiparticle, of opposite electric charge, in moving with the rotation of the spiraling universe then create magnetic fields, oppositely oriented, that are along the rotational axis of the universe as a whole. These oppositely polarized cosmic magnetic fields then separate out the matter and antimatter, competing with the gravitational field of the spiralling, expanding universe. This results in an abundance of matter in one domain of the universe and an abundance of antimatter in another domain of the universe. The prediction then follows that the atoms and molecules made up of antimatter occupy one domain of the universe and the atoms and molecules of matter occupy a different domain (as we see in our own locality of the universe.