11. Ghost Hunting

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This one might be a little “out there,” but still something that may be fun to mess around with. There are apps that will allow you to use your phone as an EMF detector. EMF stands for “electromagnetic fields,” which some paranormal investigators say are often present in unusually high levels when ghosts are nearby. There are, of course, more down-to-earth uses for an EMF detector as well, such as checking for high levels around appliances or other electrical devices. Some people believe that high EMF levels can be bad for your health.