A large black ball, originally designed by Swedish scientists for use on Mars, could be the latest weapon in the war against burglars. Telegraph Financial Services & Reader Guides The device, developed at the University of Uppsala, acts as a high-tech security guard capable of detecting an intruder thanks to either radar or infra-red sensors. Once alerted, it can summon help, sound an alarm or pursue the intruders, taking pictures. It is capable of travelling at 20mph, somewhat faster than a human being. Even worse for intruders, the robot ball can still give chase over mud, snow and water. The...