Elastic Eyesight: For the 314 million people around the world with blurry vision, just put on a pair of Joshua Silver's AdSpecs and inject light-bending silicon oil into the plastic lenses until the world comes back into focus. Since winning a POPULAR SCIENCE Best of What's New Award in 2000, Silver has been perfecting his $20 adjustable-prescription specs and, with help from the U.S. military, has handed out 20,000 pairs around the world. "I've been offered millions for the design," he says, but he hasn't sold it, fearing that companies wouldn't prioritize getting the glasses to the world's poor. He and an Indian philanthropist plan to send one million pairs to India this year.