The Exploratorium is a twenty-first-century learning laboratory, an eye-opening, always-changing, playful place to explore and tinker. For more than forty years, they’ve built creative, thought-provoking exhibits, tools, programs, and experiences that ignite curiosity, encourage exploration, and lead to profound learning. Dive in and discover what they’re all about. EXP date 1/31/2015

http://www.exploratorium.edu/