Surfing the waves: Electrons break law to go with the flow
(PHYSorg.com Physics)

If you see people walking down a street and coming to a junction, it`s difficult to predict which direction they might take. But, if you see people sitting in separate boats, floating down a stream, and the stream splits into two channels, it`s likely that most, if not all, of them will be carried down one channel, the channel that has the stronger flow.