Psi phenomena -- a sort of catch-all term for concepts like clairvoyance, psychokinesis, telepathy, and precognition -- is a recurring trope in science fiction, often paired with futuristic technology. In the comic book mythology of The X-Men, for instance, Professor Xavier uses his Cerebro machine to amplify his own innate telepathic powers. The study of psi phenomena is ongoing, although it's a controversial field in academic circles. John Kruth of the Rhine Research Center in Durham, N.C., is currently working on a project to empirically measure the biophotons emitted by those who claim to focus energy through their bodies -- yogic practitioners, holistic healers or martial artists. His latest results, "Electromagnetic Emission From Humans During Focused Intent," were recently...