Chicago Teachers Union members picket on Aug. 22 in Chicago. Sitthixay Ditthavong/AP hide caption

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With its all-sky infrared survey, NASA's Wide-field Infrared Survey Explorer, or WISE, has identified millions of quasar candidates. This image zooms in on one small region of the WISE sky, covering an area about three times larger than the moon. The WISE quasar candidates are highlighted with yellow circles. NASA/JPL-Caltech/UCLA hide caption
Tuesday
Lydia Ko accepts her winner's trophy at the CN Canadian Women's Open in Vancouver, surrounded by members of the RCMP. Harry How/Getty Images hide caption
Friday
Signs on display around town are designed to show support for Penn State's football team as a new season begins. Jeff Brady/NPR hide caption
Thursday
Wednesday
Stephen Pollard of Carroll County, Ga., who fought and survived the Civil War. Library of Congress hide caption
Tuesday
David Oh, wife Bryn and his children Braden, 13, Ashlyn, 10, and Devyn, 8, picnic in Santa Monica beach at about 1 a.m. David Oh hide caption
Jet-Lagged: NASA Engineer And His Family Are Living On Mars Time
Monday
A JetBlue Airways aircraft. Joe Raedle/Getty Images hide caption
In this May 20, 1966 file photo, comedian Phyllis Diller appears in character in the ABC-TV comedy series "The Pruitts of Southampton." AP hide caption
In the Islamabad slum where a Christian girl is accused of burning some Muslim verses, the gate to her family's home is locked and the people who live there have fled. Aamir Qureshi/AFP/Getty Images hide caption
Tony Scott in a 2009 file photo. Robyn Beck/AFP/Getty Images hide caption