In 1938, Tae Kwon Do began at the end of a wicked poker game in a tiny village in a remote corner of what is now North Korea. Today, the martial art is likely the most popular on the planet, an Olympic sport practised by an estimated 50 million students and known for its spectacular kicks. Few people, however, know about its secret and violent past; there are good reasons for the screams...The Art of Killing: The Untold History of Tae Kwon Do is a...