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Participants, often in vulnerable states, have little recourse if mistreated or injured.
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Many families are engaged in tense debates after a new study found a high percentage of N.F.L. players had developed degenerative brain disease.
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The Delta system pulls together battlefield data to identify targets, creating a miles-wide "kill zone." The technology is credited with helping to cut Russian advances to a near standstill.
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The response to Congo's raging Ebola epidemic has been hampered by a severe lack of funding and pervasive misinformation, according to people on the front lines.
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California Gov. Gavin Newsom says pressure from within the Republican Party will bring U.S. President Donald Trump back to the negotiating table with Canada after trade talks abruptly ended last week.
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The United States threatened sanctions for any country or entity that engages with Iran's gold, digital assets, aviation, shipping and tech industries. Here's why that matters.
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The CIA director John Ratcliffe made an unannounced flight to Moscow for talks, according to a source. This is Ratcliffe's first trip to Moscow since he began his tenure as the head of the Central Intelligence Agency.
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The US has threatened to isolate nations that continue to do business with Tehran, which sells much of its oil to Beijing.
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