PBS NewsHour

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A tourist swims on the Great Barrier Reef in this undated file picture. Amid pressure of losing its World Heritage status, the government has decided to expand areas subject to curbs on shipping. Photo by HO/Great Barrier Reef National Park...
Chinese Foreign Minister Wang Yi and US Secretary of State John Kerry speak following a joint news conference following meetings at the Ministry of Foreign Affairs in Beijing May 16, 2015. The United States and China clashed over a territorial...
The White House said Saturday U.S. commandos killed a senior Islamic State leader, captured his wife and confiscated ISIS computer data in an overnight raid in Syria. Photo via Getty Images. U.S. special forces killed a senior Islamic State...
U.S. Secretary of State John Kerry holds a meeting with China’s State Councilor Yang Jiechi (not pictured) at Diaoyutai State Guest House in Beijing, China, May 16, 2015. Kerry expressed hope that the Iran nuclear deal would send a positive...
A police officer stands guard in a Detroit street on July 25, 1967, as buildings are burning during riots that erupted in Detroit following a police operation. Photo by AFP/Getty Images Boston University economics professor Robert Margo, the...
Blue Bell Ice Cream is seen on shelves of an Overland Park grocery store prior to being removed on April 21 in Overland Park, Kansas. Blue Bell Creameries recalled all products following listeria contamination that caused at least 10 illnesses and 3...