Teams of two to six middle-school students (Grades 5-8) can register now for the WGBH TouchTomorrow Design Squad Global Challenge, which will be held at Worcester Polytechnic Institute on June 8, with competition times at 1PM (currently full) and 3PM. This year’s challenge is Rubber-Band Cars.  All materials will be provided, and each team will have 50 minutes to build and test its design, and then all teams will race to determine the fastest.