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Julia Barton’s grandfather was a nuclear scientist who worked in the once secret government city of Oak Ridge, Tennessee. Julia’s dad grew up there and Julia used to visit as a child. Recently, Julia decided to go back. She wanted to understand once and for all what kind of work her grandfather had been doing. (Image: David Barton, father of Julia Barton, is shown here during a visit to the American Museum of Science and Energy in Oak Ridge, Tennessee. Credit: Julia Barton)