Dr. Sylvia Earle, world-renowned Oceanographer, discusses the beauty and wonder of the ocean and the current changes in our planet at the inaugural X-STEM Symposium in Washington, D.C. on April 24, 2014. br The X-STEM Symposium is sponsored by MedImmune and the Northrop Grumman Foundation and is a program of the USA Science & Engineering Festival. br Lockheed Martin is the Founding and Presenting Host of the USA Science & Engineering Festival.