I remember a New Scientist article focusing specifically on the shipping aspect but my google-fu has let me down. This has some interesting references: http://

I remember a New Scientist article focusing specifically on the shipping aspect but my google-fu has let me down. This has some interesting references: http://www.salon.com/2008/04/21/ask_pablo_cars/ http://www.salon.com/2008/04/21/ask_pablo_cars/