On November 25th of 1915, Albert Einstein presented a paper on his General Theory of Relativity that by its end had conclusively shown that the Vulcan hypothesis was not necessary to explain the precession of the perihelion of the orbit of Mercury.  It also completely reimagined the structure of space and time and remade the universe.  In this episode of the podcast, we follow Einstein's journey of discovery from the work of James Clerk Maxwell to the eclipse observations of Arthur Stanley Eddington.