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

[Read](http://www.newscientist.com/article.ns?id=dn9136&feedId=online-news_rss20) (New Scientist)