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.
Click here for original story, Surfing the waves: Electrons break law to go with the flow
Source: Phys.org