A PERSONAL JOURNEY THROUGH RELATIVITY
There is an amusing story about Sir Arthur Eddington, who in the 1920s and 1930s was Britain's leading expert on Einstein's theory of relativity. Eddington was once asked to comment on the rumor that only three people in the world, by implication including himself and Einstein, properly understood the theory. There was a long pause before Eddington replied slowly, "I wonder who the third person is."
The theory of relativity has a fearsome reputation, the widespread belief being that any theory formulated by a man of such legendary genius as Albert Einstein must be beyond the power of ordinary people to grasp.
Yet today, Einstein's theory is routinely taught in universities around the world, and libraries contain a range of student textbooks on the subject. Either the students of today are much brighter than they are sometimes given credit for, or the theory is not so fearsomely difficult to grasp after all.