USA Today

MATTER Tales of African-American History Found in DNA By CARL ZIMMER Geneticists have studied clues in the DNA of African-Americans about the history of slavery and the Great Migration. Behind Long Airport Lines, a Chain of T.S.A. Cuts, Missteps and Crises By PATRICK McGEEHAN and RON NIXON With the Transportation Security Administration struggling with shrinking resources and low staff morale, an expert said that "a structural change is needed." A Challenge to Donald Trump's Energy Claims: Economic Reality By CORAL DAVENPORT Energy policy experts who followed Mr. Trump's proposals said that while some hewed to G.O.P. orthodoxy, others appeared implausible and ill-considered. For more U.S. news, go to NYTimes.com/US »