Isaac Asimov invoked to save us from killer robots

Campaigners are calling for laws which are similar to Isaac Asimov's first law of robotics to prohibit the use of robots which can kill without a human control switch.

Team turns to eBay to build low-cost land mine detector

US Army-sponsored researchers have built a land mine detection system for a hundredth of the cost of traditional systems - using parts they bought in online auctions.