God's Equation contains a very brief introduction to basic cosmology, highlighting recent evidence for accelerating expansion of the universe and the resulting revival of the cosmological constant. But most of it is historical and biographical, concentrating on Einstein's life and work (as it connects to general relativity). One topic treated in detail is Einstein's relationship with the astronomer Freundlich and the latter's abortive attempt to verify General Relativity by observations during a total solar eclipse in the Crimea in 1914 (the outbreak of war resulted in the participants being imprisoned); another is Eddington's successful expedition with the same goal to Principe Island in 1919. Also included are a brief history of non-Euclidean geometry and a biographical sketch of Riemann.
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