By the time you smell something, you’ve probably already killed off a few cells in your lungs. Even if you’re only soldering wires, don’t just hold your breath and work quickly. Depending on the nature of the fumes, you should open a window, turn on a fan, or install a fume extractor. At the very least, keep a respirator handy.
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.