YouTubers test out Ghost Radar, one of the most popular mobile apps for detecting "ghosts." WSJ's Andy Jordan samples the online amateur reviews.

Underneath a granite hill in southern China, a massive detector is nearly complete that will sniff out the mysterious ghost particles lurking around us.

A security researcher at Promon, Simon Lardinois, says that though not all apps are required to detect Frida, the fact that 97% do not “raises significant concerns as it becomes an open invitati ...

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Ghost hunters Roger Pingleton and ... Scientists, of course, denounce the idea. The app, like myriad other devices that claim to detect or communicate with spirits, can not be proven to work.