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What is the universe made of? Why did dinosaurs go extinct? Find out at the 2nd USA Science & Engineering Festival Expo hosted by Lockheed Martin! More than 2000 fun, hands-on activities; over 100 stage shows and author talks. A free event! www.usasciencefestival.org Sat, April 28, 2012, 10am-6pm Sun, April 29, 2012, 10am-4pm Location: 801 Mount Vernon Place, NW, Washington, Virginia 20001