MilliMobile is a first of its kind battery-free autonomous robot capable of operating on harvested solar and radio frequency power. The MilliMobile prototype has a 1 x1 cm chassis and weighs less than 1.1 g. It can carry payloads 3 times its own weight, and only experiences a 25% reduction in speed when carrying a 1 g payload. MilliMobile is able to move across a variety of surfaces, including concrete and packed soil. Image credit: Mark Stone / University...
