Above: A Von Karman vortex street downwind of the Canary Island chain in the eastern Atlantic Ocean off the coast of Africa on Feb. 27, 2015. Image credit: NASA Worldview. Editor's note ...

• On April 16, 2008, Benedict XVI celebrated his 81st birthday, and on that day he was at the White House, after which he attended a prayer service with bishops at the Basilica of the National ...

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