“Looking to take advantage of sperm’s awesome swimming ability, researchers have cyborg-ized bull semen by positioning them inside tiny metal cylinders that can be steered with magnets. This means we now have a way to control a cell’s direction inside the body — a breakthrough that could lead to efficient microscopic robots.
With the mobility aspect taken care of, the researchers were able to orient the microtubes using external magnetic fields. The process works similarly to how a compass needle aligns with Earth’s magnetic field. …biohybrid micro-robots are harmless to the human body, they provide their own power, and they can swim through viscous liquids”