Yes. A day spent in shopping involves about eight miles of walking through stores and streets. It would be better exercise, of course, if this distance was walked in the open air. No wonder shopping is tiring!
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.