Einstein’s special and general theories of relativity are a large part of modern physics. A few scientists before Einstein toyed with the special theory of relativity but in 1905 Einstein showed the world he had grasped the theory that relates mass, energy, time, and space. However, in 1915-1916 Einstein grasped the theory that generalizes the law of gravity before many other scientists. It is said that if Einstein had not published the general theory of relativity it would have been years or decades and teams of scientists to come to the theory. Now, a quote from Einstein himself, "the important thing is not to stop questioning. Curiosity has its own reason for existing. One cannot help but be in awe when he contemplates the mysteries of eternity, of life, of the marvelous structure of reality. It is enough if one tries merely to comprehend a little of this mystery every day."