The Most Popular Science
This week's most-read articles on PopSci.com
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?