Scientists detected the gravitational waves after a pair of unusual black holes collided.
As we mark the 10th anniversary of the start of the war in Afghanistan, we check in on the National Guard, which has been stretched especially thin fighting it.
Members of the Guard used to be known as “weekend warriors,” because they train one weekend per month and two weeks in the summer. They also help out with disaster response in the U.S.
But they also see combat– almost half of the U.S. fighting force in Iraq and Afghanistan is National Guard, and they’ve historically been involved in wars.
More statistics that were unthinkable a decade ago:
Robin Young and Jeremy Hobson are hitting the road. Our Tumblr brings you behind the scenes of our election coverage.