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Smoke rises over Saif Al Dawla district in Aleppo, Syria, in 2012. Russia and the Syrian government say they will open humanitarian corridors in Aleppo and offer a way out for opposition fighters wanting to lay down their arms, Russian Defense Minister Sergei Shoigu said Thursday.

Published on July 28, 2016

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Dr. Michael Frost demonstrates use of Probuphine, an implant that dispenses medication to treat opioid addiction.

Published on July 28, 2016

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Democratic presidential candidate Tim Kaine salutes the crowd after his address at the Democratic National Convention Wednesday night.

Published on July 28, 2016

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Republican Presidential candidate Donald Trump at a campaign stop in Scranton, Pennsylvania on Wednesday.

Published on July 28, 2016

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Donald Trump makes a campaign stop in Scranton, Pa., on Wednesday. He faced a day of harsh criticism from across the political spectrum for appearing to urge Russia to hack his Democratic rival's email.

Published on July 28, 2016

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The reentry of a Chinese rocket stage lit up the sky over Utah, Nevada, and California Wednesday night.

Published on July 28, 2016

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The re-entry of a Chinese rocket stage lit up the sky over Utah, Nevada and California on Wednesday night.

Published on July 28, 2016

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In 1843, Scottish woodturner Daniel M'Naughten killed Edward Drummond while suffering from paranoid delusions. His trial established a legal definition of criminal insanity, known as the M'Naughten rules.

Published on July 28, 2016

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A note written by Hinckley to actress Jodie Foster just over three weeks before President Reagan and others were shot was used as evidence in his trial.

Published on July 28, 2016

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This undated photo was taken of John Hinckley Jr. in front of the White House before he attempted to assassinate President Ronald Reagan in D.C., on March 30, 1981.

Published on July 28, 2016

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This undated photo was taken of John Hinckley Jr. in front of the White House before he attempted to assassinate President Ronald Reagan in D.C., on March 30, 1981.

Published on July 28, 2016

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"There is plenty of room at the bottom": An excerpt from a landmark 1959 lecture by physicist Richard Feynman is written on a sheet of copper with chlorine atoms.

Published on July 28, 2016

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James Ramsey has resigned as the University of Louisville's president, ending weeks of uncertainty over his status.

Published on July 28, 2016

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Torben Rick, an anthropologist at the Smithsonian's National Museum of Natural History and lead author of the research, examines a 1,500-year-old oyster shell in the museum's collection.

Published on July 28, 2016

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Members of the research team, Sean McCanty and Courtney Hofman, excavate an ancient oyster shell midden at the Smithsonian Environmental Research Center in Edgewater, Md.

Published on July 28, 2016

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A typical Native American oyster deposit, or midden, dating to about 1,000 years ago. Archaeologists are finding clues to sustainable oysters harvesting in these remains.

Published on July 28, 2016

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Chelsea Clinton and her husband, Marc Mezvinsky, leave the hospital after the birth of their son, Aidan, last month, along with her parents Bill and Hillary Clinton.

Published on July 28, 2016

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President Bill Clinton and First Lady Hillary Clinton, wave from Air Force Andrews Base as they prepared to depart with Chelsea for her to begin her freshman year at Stanford University.

Published on July 28, 2016

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Chelsea Clinton with her mother Hillary Clinton at the 1992 Democratic National Convention in New York City where her father accepted the Democratic nomination.

Published on July 28, 2016

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Chelsea Clinton stands behind her mother after Hillary Clinton won the New York Democratic primary in April.

Published on July 28, 2016

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