Scientists may have identified the first known dust particles from outside our Solar System, in samples returned to Earth by a Nasa space mission. A team of scientists, with the help of more than 30,000 worldwide citizens, has identified seven exotic grains. The material was captured by the

With a set of computerized instructions and flashes of infrared light, up to 1,024 tiny robots organized themselves into the shape of a starfish, the letter K and other complex designs, researchers report August 15 in Science. The robots' collective behavior mimics the way 100,000 ants quickly