Science and technology

Associated Press
Senate Majority Leader Mitch McConnell of Ky. speaks to the media during a news conference following a Senate policy luncheon on Capitol Hill in Washington, Tuesday, June 2, 2015, as legislation to end the National Security Agency's collection of Americans' calling records while preserving other surveillance authorities is expected to clear the Senate late Tuesday. But House leaders have warned their Senate counterparts not to proceed with planned changes to a House version. (AP Photo/Andrew Harnik)

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