For the record. 8-) Once one realises that materials are held together at all scales by external pressures and not internal tensions, and that we are dealing with a full plenum (turtles all the way) it becomes perfectly obvious what magnetism is.
It is the flow of substance between a source and a sink. In other words, it's an elephant. Frank Grimer As for nature's purse, it's not merely large. It's limitless. 8-)
