"Version: 20171001"--Title page verso."A Morgan & Claypool publication as part of IOP Concise Physics"--Title page verso.Includes bibliographical references.1. Introduction -- 1.1. Magnetic fields -- 1.2. Turbulence -- 1.3. Turbulence versus B-fields -- 1.4. OK, so what about tai chi?2. Magnetic fields -- 2.1. Magnetic flux freezing approximation -- 2.2. Magnetic critical mass -- 2.3. The tai c…