Unexplained Phenomenon Version 2.0 - Homopolar Motor

Millions watched my demonstration titled Unexplained Phenomenon -- Simplest Electric Motor. Thousands tried to explain what was going on. Most got it wrong. This video demonstrates another version of the motor. This one has 4 parts, rather than 3, but it is easier to build. If you thought you could explain version 1 you may have to rethink your explanation after seeing version 2.