Throughout history, people have sought ways to contact the dead and spirits. Such experiences challenge beliefs and often set people on a path of deeper exploration, looking for validation--and ways to have controlled, direct contact. Do spirit communication devices really work? What are the prospects of someday being able to pick up a cell phone or sit in front of a webcam and talk to the Other Side? While proof of contact is still elusive, there is an abundance of tantalizing evidence and experience to inspire people.

For the past century, inventors have been inspired by the...