(From top) No shark bait here; nighttime open water and cliff rescues are all in a day's work. A Coast Guard rescue swimmer from Air Station Sitka in Alaska dangles below an HH-60J Jayhawk helicopter while practicing
a cliff rescue on Biorka Island.
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.