⚡️LATEST: Meet Hopto, an energy-saving drone that BOUNCE instead of FLY. Hopping robots can cross ice, wet soil, rubble and uneven terrain using spring-loaded legs that recycle energy. MIT’s insect-scale hopper is smaller than a thumb, while Hong Kong’s 35-gram Hopcopter can jump up to 1.63 meters. The idea is simple. Use the ground to save power instead of flying over every obstacle.