Canadian researcher Sylvain Martel has developed a ultra tiny machine that can be propelled and steered through a swarm of 3,000 bacteria.
The tiny device, which measures just 300x300 microns, contains a solar cell, communications circuit and sensor. By sensing pH levels and sharing them via electromagnetic pulse to a connected computer, researchers were able to control magnetically-influenced bacteria to precisely relocate their machine to seek out an environment of higher pH.
We know, that's some intensely scientific info. Think of it as a Wooly Willy on a very, very tiny scale. Technology Review has a video of the phenomenon, and if you're interested in nanotech, it's worth the 30 or so seconds. [Technology Review via KurzweilAI]