Your mother told you never to speak to strangers, but what if the stranger was a robot on wheels, who was lost and needed your help? Thirty-eight people in this very predicament chose to speak to the waylaid robot, whose task was to cross a busy city without a map or GPS. All it could do was ask directions.
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.