MIT researchers have created nanoscale robots about the size of a human egg cell that can float freely in water or air. The robots do this by piggybacking on colloids, insoluable molecules that are so small they can stay suspended indefinitely in air or liquid. The robots are self-powered by a photodiode that provides a small source of electricity, enough to collect, store, and relay information about its environment. Learn more about these tiny nanoscale robots at MIT.

patient wearing a headset that produces sound waves to treat dementia