Scientists detected the gravitational waves after a pair of unusual black holes collided.
Author John Steele Gordon looks at the role air conditioning played in the South becoming a political powerhouse — especially a Republican powerhouse. Thanks to AC and desegregation, Gordon writes, the South was able to develop. People wanted to live there — companies wanted to move there.
Robin Young and Jeremy Hobson are hitting the road. Our Tumblr brings you behind the scenes of our election coverage.