Steel just as it comes from the steel yard looks undeniably cool. If you leave it that way though, you'll be treated to a rusty piece of metal in short order, as the iron in the steel inevitably oxidizes from the moisture in the air. To keep it clean, you need some kind of coating that seals off the surface. You can paint it and you can coat it with a clear polyurethane, but my favorite finish is simple bowling alley wax.
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.