At the heart of the Silicon Valley is Stanford University, whose professors and grads have founded dozens of key technology companies, from Hewlett-Packard to Google. Hundreds more startups have of course failed, but the university remains a key hub for new technology ideas. So every year the university puts on the Cool Product Expo to showcase innovative ideas, whether originating at Stanford or not. Not all the exhibitors at this week's event were as cool as you might think, but many are. Here are my seven top picks for this year's truly cool tech from the expo.