"Smart magnets" that connect either way? Hi all. I was wondering about a particular kind of toy train that is sold to young children these days. I bought a few for my son for Christmas, and I am trying to figure out how they work. The train cars have magnetic connectors that can attach to the next car, but the thing is, they attach either way, even if you turn the cars around such that the polarity should be reversed. The manufacturer calls them "smart magnets." Does anyone know how this is being done? Here is a link to the product: https://www.amazon.com/Take-Along-Thomas-Friends-James/dp/B0006TNC0K Thanks!