Everyone's heard of it, but what does E=mc² really stand for? And why did it change the world? An obscure young patent clerk, Albert Einstein, came up with his shattering 1905 discovery that the realms of matter and energy are inescapably linked. Einstein's Big Idea reveals the roots of his astonishing breakthrough in the human stories of men and women whose innovative thinking across four centuries helped lead to E=mc² , and ultimately unleashed the power of the atom. As one discovery builds on the next, Einstein's Bid Idea show how Einstein's saga began with the personal lives of the pioneers of modern science and their years of persistence, ingenuity, sacrifice, and struggle against the odds. The film stars Aidan McArdle (from Ella Enchanted) as Einstein, and Shirley Henderson (from Harry Potter) as Einstein's first wife, Mileva Maric. Narrated by John Lithgow, this documentary is based on the book "E=mc² -A Biography of the World's Most Famous Equation" by Davis Bodanis.