Key points from article :
National Technical University of Athens working to develop nanobots that could be injected into the brain and then crawl along neurons, pinching them to see if they are healthy or not.
Brain damage can occur deep in the brain and be difficult to see in scans.
Team has created a computer simulation using bat swarming behaviour to direct nanobots by following acoustic signals.
Just four bots would be needed to find a small tumour within a matter minutes.
Theoretical at the moment as uncertain how tiny devices could sense these acoustic signals.
