Members of the Tripoli amateur rocketry association polish a one-third-scale model rocket of the World War II-era German V2 rocket. Tripoli's planned launches at the X Prize Cup were scrubbed because of high winds. The group was demonstrating its technology but is not planning a larger model for human flight.
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.