In 1915, Albert Einstein created his General Theory of Relativity. His theory was that gravity was not a force, but a consequence of the fact that space-time is curved or "warped" by the distribution of the mass and energy in the Universe. It concerned the largest things in nature: planets, stars and galaxies. Then, in the 1920s, Einstein became deeply disturbed by the work of Werner Heisenberg in Denmark, Paul Dirac in Britain and Erwin Schrodinger in Switzerland. These three scientists promoted a new look at reality called quantum mechanics: the physical theory of the smallest things in nature: electrons, photons, gluons and the like. Einstein never accepted quantum mechanics since it included randomness and the unpredictability of these small particles. What cosmologists have since been attempting to do is to consolidate the behavior of the very big and the very small into one theory. This was called the Standard Model, but could be called a theory of nearly everything.
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