So, I've found this video on youtube showing the "amazing" things they're doing have been researched?
For the "speaking in tongues" thing:
"In 2006, at the University of Pennsylvania, researchers, under the direction of Andrew Newberg, MD, completed the world’s first brain-scan study of a group of individuals while they were speaking in tongues. The study concluded that while participants were exercising glossolalia, activity in the language centers of the brain actually decreased, while activity in the emotional centers of the brain increased. During this study, researchers observed significant cerebral blood flow changes among individuals while exercising glossolalia, concluding that the observed changes were consistent with some of the described aspects of glossolalia. Further, the researchers observed no changes in any language areas, suggesting that glossolalia is not associated with usual language function."
Just watch, you too will be on the floor, perhaps from laughter!