Invention of the day: Robo-roach.

A matchbox-sized robot that can infiltrate a pack of cockroaches and influence their collective behaviour has been developed by European scientists.

The tiny robot smells and acts just like a roach, fooling the real insects into accepting it as one of their own. Through its behaviour, the robot can persuade a group of cockroaches to venture out into the light despite their normal preference for the dark, for example.