Nanobots could swarm like bats to hunt out brain tumours

Investigating the deepest regions of a person's brain is no easy task. Tiny robots crawling through it could help. It's a tantalising idea, but one problem is how to direct such nanobots on their travels. One way to do this would be to program them to search like bats hunting for prey, says a team who have created a computer simulation of this, and hope to trial their method in people in a couple of years. Engineers around the world are working on various designs of nanobot, particularly ones that could release medicines inside the body.