What do you get when you cross a Predator drone and a hummingbird? For those times when a Predator is just too big for a backpack, some British troops can now deploy a new palm-sized drone equipped with a camera.
The 4-inch drone, called the Black Hornet Nano Unmanned Air Vehicle made by Norway-based Prox Dynamics, flies silently for up to 25 minutes and zips around at speeds up to 22 miles per hour. Although the inventor, Peter Muren started out designing those little R/C toy copters, don't expect to pick these up at Toys 'R Us -- each one cost $125,000.
No word on when Prox Dynamics will equip the drone with munitions so it can take out enemy pigeons.
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.