Propeller motion charges the batteries

Almost a dozen creative ways your digital camera can help you guard against theft, fraud, and moving violations

The first fully electric plane is silent, and impressively cheap to fly

Five Facebook games that our “Playing Around” columnist deems fantastic

Chatting with the man who wants to be your your next-door neighbor on Mars

And hey, Stuart Fox is still wondering, where are those genetically engineered flying robot butlers we were promised?