It was declared on Tuesday night in South Korea, and it was voted down afterward by the nation's lawmakers. But what is martial law? That topic and a report on a British "gingerbread city" lead off today's show. They're followed by information about the U.S. holiday shopping season, the benefits of mangroves to the environment, and the discovery of a new species of sea slug. Finally: police in pursuit of a "ham on the lam."