Cell Sized Injectable Sensing Robots
MIT engineers are building some extremely small electronic devices, with the idea of putting billions of them in the bloodstream to sense illnesses or to monitor therapies. One example “consists of a circuit bonded to an insoluble colloid particle. It’s only about .1 mm across, making it nearly invisible to the naked eye and giving it the ability to float in the air or be suspended in liquids without causing any ill effects, even in somewhat large numbers. They’re also so tiny that they can remain floating or suspended indefinitely because the pull of gravity on them is less forceful than random collisions with other particles in the air or liquid, meaning that they will never sink to the ground or settle the bottom of a body of liquid.” MORE
Image Credit: MIT