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150412-N-PO203-228
150412-N-PO203-228 NATIONAL HARBOR, Md. (April 12, 2015) Midshipman 3rd Class Carl McKay, right, demonstrates what happens to a marshmallow in a vacuum during the Naval STEM Exposition. The expo, held in advance of the 50th annual Sea-Air-Space Exposition and co-sponsored by the Office of Naval Research (ONR) and the Navy League STEM Institute, provided middle and high school students an introduction to naval STEM careers and applications through guest speakers and hands-on activities. (U.S. Navy photo by John F. Williams/Released)