I love surplus stores. They’re basically the tech version of a yard sale, with tons of stuff that would be nearly impossible to find or afford new. These are three of my favorites. Between them, you should be able to find just about anything you need, no matter how crazy the project.
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.