Top-ranked mathematician and computer scientist, Dr. Peter Winkler shares the exciting world of puzzles with students at the inaugural X-STEM Symposium in Washington, D.C. on April 24, 2014.

The X-STEM Symposium is sponsored by MedImmune and the Northrop Grumman Foundation and is a program of the USA Science & Engineering Festival.

Lockheed Martin is the Founding and Presenting Host of the USA Science & Engineering Festival.

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