The object pictured here (which you guys nailed almost immediately) is known as a boring bar [insert drinking pun here], which is used on a metal lathe to cut the inside of a part. I use this tool less frequently than most of my other lathe tooling, but it is nonetheless indispensable. More about what to do with this sucker after the jump.
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.