We're big fans of Arduino work here at PopSci (see: here, here, and here) and so is Red Bull. That's why they created the hack- and make-a-thon Red Bull Creation, a 72-hour competition that pits inventors against each other and streams it all online. This year, we've come together to bring you the competition, which runs from July 19 to 22. (Past projects have included a tweeting coffee pot and real-life Pong, so we're excited to see what's next.) For all the details, check out the official site and the video below. [Red Bull USA]
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.