Scientists detected the gravitational waves after a pair of unusual black holes collided.
Accused gunman Jared Lee Loughner pleaded not guilty to 49 felony counts this month, including murder and attempted murder, in connection with January’s shooting rampage in Tucson that killed six people and wounded 13, including Congresswoman Gabrielle Giffords.
The shooting has led Arizona lawmakers to debate whether to require community colleges and universities to inform local mental health agencies whenever a student or faculty member is suspended or expelled because of threats of violence.
We speak with Boston University Chief of Police Thomas Robbins about ways that colleges handle threats from students, including using a computer program called MOSAIC to evaluate their potential for violence.
We also hear from Daniel Hess, director of counseling services at Concordia University in St. Paul, Minnesota.
Robin Young and Jeremy Hobson are hitting the road. Our Tumblr brings you behind the scenes of our election coverage.