The NPR series, " the science of spirituality " leads off with... More than half of adult Americans report they have had a spiritual experience that changed their lives. Now, scientists from universities like Harvard, Pennsylvania and Johns Hopkins are using new technologies to analyze the brains of people who claim they have touched the spiritual — from Christians who speak in tongues to Buddhist monks to people who claim to have had near-death experiences. Hear what they have discovered in this controversial field, as the science of spirituality continues to evolve. And then under the "god chemical" article , it continues... At Johns Hopkins University, research suggests that chemicals that act on the serotonin system trigger mystical experiences that are life-altering. Serotonin is a chemical messenger that helps regulate mood and sleep. Now those neurologists -- and others -- are replicating studies from the 1960s in which patients wit...