On a peaceful summer's night in July 2008, along a stretch of the Trans Canada Highway in Manitoba, the unthinkable happened. What started as just another Prairie bus ride became a nightmare when the lives of two passengers intersected tragically and resulted in the murder of Tim McLean. In this program, CBC correspondent Bob McKeown takes us inside what happened on Greyhound 1170 through the eyes of the surviving passengers and other witnesses.

Hard as it is to swallow, cutting-edge theories are suggesting that our universe may not be the only universe. Instead, it may be just one of an infinite number of worlds that make up the multiverse. In this show, Brian Greene takes us on a tour of this brave new theory at the frontier of physics, explaining why scientists believe it's true and showing what some of these alternate realities might be like. Some universes may be almost indistinguishable...