One of the great megatrends is this movement towards decentralization rather than increased centralization. The leading paradigm of this is the personal computer and how it decentralized information processing from highly centralized processing of the mainframe computers. The wireless movement took this even further, in liberating us from the limitations of wires. Rail was the solution for transportation in the 19th century; the automobile supplanted them in the 20th century, and because of that success, created problems of its own. However, it is highly unlikely that the solution to the auto problem is to go back to rail; that would...