Oppenheimer biographer highlights lessons from Nolan's film. Christopher Nolan's adaptation focuses on the "reality" of the character and his influence on our times.

“In this sense, he is the most important man who ever lived,” says Kai Bird, author of the biography of the inventor of the atomic bomb. On Sunday, Kai Bird and his wife will attend the Oscars ceremony in Hollywood. They will support Oppenheimer, ultra-favorite given its 13 nominations.