MicrobeWorld

Researchers from ETH Zurich have built E.coli sized robots that they hope will be used for various biomedical applications. "They look like spirals with tiny heads, and screw through the liquid like miniature corkscrews. When moving, they resemble rather ungainly bacteria with long whip-like tails. They can only be observed under a microscope because, at a total length of 25 to 60 µm"