For the past 50 years Paulding, Michigan has been at center of a controversy involving mysterious light on the horizon. Using everything from a high-powered laser to a light aircraft, the team investigates what has caused thousands of onlookers to ask, "what is that?" While in San Antonio, Texas a lonely railroad crossing serves as the backdrop for a 70-year debate where the road slopes up to the tracks, yet parked cars seem to roll uphill over the tracks. Local legend claims the ghosts of children push the cars, but the team uses science to break the case.