Most simply, a wormhole is a path created by a worm burrowing through the ground. The term originated in late 16th-century England and appears in several works by William Shakespeare, including Henry V and The Rape of Lucrece. In the late 1950s wormhole took on another meaning. It became popular among physicists studying the relatively new concept of space-time. They used it to refer to a theoretical interconnection, often thought of as a long tube, between distantly located points in space-time. In recent years the word has filtered into common usage, denoting a way in which one might get from point A to impossibly distant point B, or a way to achieve the unthinkable.