Einstein’s Theory of Relativity was developed separately in two parts, the Special Theory published in 1905 dealing with a flat space (that is, without gravity) but including time, and the General Theory published in 1915 that included gravity as well as space and time. An early supporter of Einstein’s rather esoteric theories was Sir Arthur Eddington, a scientist at Cambridge University. There is an anecdote (in many versions) that after one of Arthur Eddington’s lectures he was queried by physicist Ludwik Silberstein, “Professor Eddington, you must be one of three persons in the world who understands General Relativity.” When Eddington paused for a moment, Silverstein replied, “Don’t be modest, Eddington”, to which Eddington replied, “On the contrary, I am trying to think who the third person is.”