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Sneha Joisha, Parin Gupta, and Alfred Premkumar (top from left) explore an experiment with gravity August 12 at Loudoun County (Va.) Public Library's Asburn branch, part of an ongoing series of weekly programs offered at seven branches that focus on math and science.

Mohammed Ullah (bottom) learns about the power of magnets July 29 at Loudoun County (Va.) Public Library's Cascades branch.