In a cooperation between the Swiss Federal Institute of Technology in Zurich and Israel Institute of Technology (Technion) scientists have developed microscopic “nanoswimmers” that can penetrate blood and even thicker liquids that exist within the body, something that corkscrews modeled on bacterial flagella have been disappointingly bad at. The tiny devices are made of three connected chains, one made of a polymer and two consisting of nanowires that can be influenced by an external magnetic field to flap in a given direction. This allows the system to control the direction in which the nanoswimmers are moving, so any on-board cargo such as drugs or some sort of nanoparticles can be precisely placed inside a tumor, for example.