Ghost hunting goes high tech

Ghost hunters spend lots of time investigating The Winchester House in San Jose. From The San Francisco Chronicle:

Before there were Ghostbusters there was Thomas Alva Edison. The father of sound recording technology wanted to make a device that could record the voices of the dead, according to his diary. Since then, just about every recording and measuring technology invented has eventually fallen into the hands of ghost hunters, who stake out haunted houses, graveyards and other spooky locales to try to capture empirical evidence of restless spirits. To this end, they utilize the latest in sound, video and still-image recording, as well as sensors that detect changes in temperature, electromagnetic fields and radiation. "We're looking for a ghost or spirit's influence on the environment," said Vince Wilson, author of "Ghost Tech, the Essential Guide to Paranormal Investigation Equipment."