Big ideas on display at Intel science fair (photos)

SAN JOSE, Calif.--In a showcase of cutting-edge research and innovation, with more than 1,600 students from 59 countries participating, Intel hosts the world's largest pre-college science competition, the Intel International Science and Engineering Fair, here this week. Projects exploring broad topics such as alternative energy, health care, and robotics are all vying for more than $4 million in prizes.