On November 25th, 1915, Einstein published his greatest work: general relativity. The theory transformed our understanding of natures laws and the entire history of the cosmos, reaching back to the origin of time itself. Now, in celebration of the 100th anniversary of Einsteins achievement, NOVA tells the inside story of Einsteins masterpiece. The story begins with the intuitive thought experiments that set Einstein off on his quest and traces the revolution in cosmology that is still playing out in todays labs and observatories. Discover the simple but powerful ideas at the heart of relativity, illuminating the theory-and Einsteins brilliance-as never before. From the first spark of an idea to the discovery of the expanding universe, the Big Bang, black holes, and dark energy, NOVA uncovers the inspired insights and brilliant breakthroughs of "the perfect theory."