I've been reading Robert Caro's latest book, Working , detailing how he researched and wrote his magisterial, vividly detailed biographies of Robert Moses and Lyndon Johnson. Caro began his career as a newspaper reporter. Though his books are historical biographies, his methods are investigative journalism at its very best: deep research into important, often obscure documents, interviewing people who know - both the powerful and the powerless - anyone who can show readers what is actually going