physicsindrops:

Swimming Micron-size Robots? Flowbots? These cylindrically-shaped double emulsions, drops inside of drops, wiggle and buckle after they detach from the nozzle and  flow through a microfluidic capillary device.  Our goal is to utilize them to detect and cure diseases in the human body, like something from the science fiction movie Fantastic Voyage, by loading them with drugs and sensors. (Flowbots and gif credit: L. L. A. Adams)