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July 25, 2015

A view of a cluster of young stars (million years old), known as the North American Nebula or the Plesian Nebula (top right). This is a clean and processed version of the original Spitzer Space Telescope image. NASA/JPL-Caltech. Illustration: shutterstock

New video: A high-resolution tour of the center of the Milky Way

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Photomicrograph of a flat lens. Credit: Patrice Geneve, Federico Capasso and Francesco Aita, Harvard SEAS

A new figure for the lens - flat as a pancake / Prachi Patel

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A vegetable garden in an urban environment. Photo: shutterstock

The challenge facing humanity / Michael E. Weber

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