Filter out ammonia, chlorine or swirling toxic dust. The Advantage respirator gives a snug fit in seconds, using a harness that tightens two head-straps with a single clip. Its facepiece comes in three sizes to protect all types of people. Advantage 420 Half Mask Respirator $40; msanorthamerica.com
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.