In this undated photo provided by the U.S. Department of Energy, a shipment of nuclear waste arrives at the Waste Isolation Pilot Plant, near Carlsbad, N.M. U.S. Department of Energy, Carlsbad Field Office/AP hide caption

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13 Workers Exposed To Radiation At N.M. Nuclear Waste Dump
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Cat Or Dog? Sure, you can easily tell the difference. But a machine may not be able to guess on the first try. iStockphoto hide caption

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Deep Learning: Teaching Computers To Tell Things Apart
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U.S. Government To Back Loans For Nuclear Power
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The National Ignition Facility's 192 laser beams focus onto a tiny target. LLNL hide caption

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Scientists Say Their Giant Laser Has Produced Nuclear Fusion
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Woolly mammoths depended on tiny flowering plants for protein. Did the decline of the flowers cause their extinction? Per Möller/Johanna Anjar hide caption

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Woolly Mammoths' Taste For Flowers May Have Been Their Undoing
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Assad Regime Slows In Handing Over Chemical Weapons
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An artist's concept of a narrow asteroid belt orbiting a star similar to our own sun. NASA/JPL-Caltech hide caption

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Asteroid Belt May Be Just One Big Melting Pot Of Space Rocks
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The Chinese flag is seen in front of a view of the moon at Beijing's Tiananmen Square in December, when China's first moon rover touched the lunar surface. That feat was widely celebrated — but observers believe the rover has now run into serious trouble. Mark Ralston/AFP/Getty Images hide caption

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China's Jade Rabbit Rover May Be Doomed On The Moon
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An unidentified inspector from the International Atomic Energy Agency examines equipment at the Natanz facility in Iran on Monday. Kazem Ghane/AP hide caption

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Nuclear Inspectors Enter Iran, With Eyes Peeled For Cheating
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A flock of Northern bald ibises forms a flying V. Courtesy of Markus Unsöld hide caption

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The Science Behind Flying In V Formation
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This composite image shows new details of the aftermath of a massive star that exploded and was visible from Earth over 1,000 years ago. Chandra X-ray Observatory Center/NASA hide caption

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Dying Stars Write Their Own Swan Songs
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Can't Stand The Cold Snap? Don't Go To Antarctica
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The National Security Agency headquarters at Fort Meade, Md. The agency has been trying to build a quantum computer, The Washington Post reports — but that news doesn't surprise experts in the field. Saul Loeb/Getty Images hide caption

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The NSA's Quantum Code-Breaking Research Is No Secret
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Never mind holiday stress. Steer clear of black holes, or risk "spaghettification" — or worse. Katherine Streeter for NPR hide caption

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Stretch Or Splat? How A Black Hole Kills You Matters ... A Lot
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NASA astronaut Chris Cassidy performs a spacewalk in May to inspect and replace a pump controller box on the International Space Station. On Saturday, two astronauts will perform the first in a series of similar spacewalks to fix a broken cooling line on the ISS. AP hide caption

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Astronauts Ready For Marathon Spacewalks
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