Let's get this out of the way: ghost detection is based on junk science. It's trying to prove something that's unprovable almost by definition, using theories that have little connection to the real world. But if you are going to chase phantoms, you might as well have the best technology at your disposal, right? GhostArk certainly thinks so. It's developing a pocketable ghost detector that supposedly has everything you need to track down supernatural beings, including an electromagnetic field meter, high-sensitivity microphones, radio frequency sweeping and sensors for both atmospheric pressure and temperature. Think of it as an audio recorder on steroids -- you can even add white noise to "bolster the spirits' strength." It's a clever concept, even if none of its findings would stand up under academic scrutiny.