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Student-built robots take a swim test

In the National SeaPerch Challenge, 70 high school and middle school teams from across the country — including five from the District, 10 from Virginia and 18 from Maryland — competed to see who could build the best underwater robotic vessels.

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Harmit Singh, left, and Ben Kolding, students at Patriot High School in Nokesville, prepare to send their robot underwater during the second annual National SeaPerch Challenge at the Manassas Park Community Center.

Jahi Chikwendiu / THE WASHINGTON POST

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