And, twenty years before that, this group claimed that binaural "synchronization" of the hemispheres of the brain could lead to out-of-body travel. https://www

And, twenty years before that, this group claimed that binaural "synchronization" of the hemispheres of the brain could lead to out-of-body travel. https://www.monroeinstitute.org/ https://www.monroeinstitute.org/ I think they've backed down on some of those claims over the last 30 years, but they'll be happy to take your money for a 5 day onsite retreat.