You can't get smaller than that, because when you probe even smaller distances, water is no longer a sensible concept. This proved fission occurred and confirmed Einsteins work. So, the sunlight given off by the Sun today had its origin as a gamma ray produced by nuclear reactions deep in the Suns core. For starters, the E stands for energy and the m stands for mass, a measurement of the proposes to use the International Space Station. More practically, it is the amount of energy that would come out of a 1 gigawatt power plant, big enough to run 10 million homes for at least three years. Though it is possible that the serious pursuit of an atomic weapons' program in the US might have been delayed if not for Einstein's urgings, his impact has often been overstated. Thus a proper quantum theory of water has to take into account the fact that there are individual molecules. Note that the third step requires two helium-3 nuclei to start; the first two steps must happen twice before the third step can occur. The size scales involved in those environments are subatomic. 5. Quantum Theory Einstein's speech on the NBC program was typically punchy, warning that the "idea of achieving security through national armament is a disastrous illusion," that the arms race between the US and the Soviet Union had assumed a "hysterical character," and that with the advent of hydrogen bombs, "radioactive poisoning of the atmosphere and hence annihilation of any life on Earth has been brought within the range of technical possibilities.". 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