We’ve all wondered if there are ghosts in our homes. Unexplained flicker of the lights, a sound in an unoccupied room, a little voice telling you to eat cookies (okay, scratch that last one) all make you wonder if you’re really alone. If you fancy yourself a ghost hunter, Mr.Ghost is a Kickstarter project that aims to help you find out. It plugs directly into an iPhone’s mic port to detect electromagnetic radiation sources. Users log on to their free app to detect invisible EM radiation from household appliances, your car, whatever’s in your closet or under your bed, or anything you want to point it at.