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Physicist Kent Irwin (first image,far left) and colleagues work with a delicate wire coil called an inductor for a prototype of Dark Matter Radio, their radio circuit that searches for dark matter. SLAC National Accelerator Laboratory
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The U.S. Mint's Dr. Sally Ride American Women Quarter features a likeness of the late astronaut by artist Elana Hagler on its reverse and a portrait of George Washington composed and sculpted by Laura Gardin Fraser on its obverse. (U.S. Mint)
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Photo by Linda Cicero
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From left, Eric Cooper, Philipp Kunkel, Avikar Periwal and Monika Schleier-Smith.
(Image credit: Khoi Huynh)