Think you know your Stuff? Be the first to identify 10 mystery materials from a set of clues and win a prize! Grand Prize includes a MacBook Air, $100 iTunes gift card, video chat with David Pogue, technology columnist and host of Making Stuff. 10 runners-up will receive an iPod Touch. The "What's This Stuff?" Contest runs from January 12 to January 26, 2011 and can be found during this period at http://pbs.org/nova/makingstuff