DARPA has a thing for butterfly tech. Last week it was sensors based on butterfly wings. This week, it's a space junk capturing vehicle armed with 200 nets that gathers space garbage, much as a lepidopterist would net butterflies for a specimen collection. The technology was presented on Friday at the annual Space Elevator conference.
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.