Explore large structures and what it takes to build them with BUILDING BIG™, a five-part PBS television series and Web site from WGBH Boston.” Aimed at middle school students, the web site contains hands-on labs, activities and challenges that relate to bridges, domes, tunnels and skyscrapers. You can also virtually experiment with loads, materials and shapes. Can you select the appropriate material to build a 50-story deluxe apartment building? Or pick the best way to construct a subway tunnel through the soft sand underneath a city? How about finding the right bridge for a particular location?