This is a very fine documentary on the events leading up to and surrounding the ultimate confirmation of the General Theory of Relativity. Besides the scientific information, you learn a lot about Einstein's personal and professional life, which was more eventful for a retiring academic than one would think, including something about his family life and his two wives. It took eight tense years for Einstein to finally get confirmation during a solar eclipse of his theory. Marginal photographic equipment, uncooperative weather, remote and hard to reach locations--even a world war--interfered with these eclipse expeditions, until one (William Wallace Campbell's, whose first expedition had failed) finally succeeded. The film includes interesting archival footage shot from a WWI biplane of the Lick Observatory atop Mt. Hamilton, which for a time housed the largest reflector in the world (100 inches), before the 200-inch Palomar telescope exceeded it, and the second largest refracting telescope (36 inches), which was interesting to see also. As a young amateur astronomer 30 years ago, I was fortunate enough to attend an open house there once and got to look through the Hooker 36-inch refractor. With commentary by theoretical physicist Michio Kaku, astrophysicist Neil Degrasse Tyson, Einstein expert and historian of science Diana L. Kormos-Buchwald, and other experts to flesh out the story, it's an excellent account of this important event in science.