Many women have dense breasts, and they may benefit from other forms of cancer screening beyond mammograms. But none of the options is ideal, and the available data don't make the decision easier.
The train was traveling at twice the speed limit as it entered Hoboken Terminal, according to a preliminary examination of video and data records recovered from the wreckage.
It started with a sighting in the woods in South Carolina. Now people dressed as clowns are being arrested across the country, and face-painted Facebook threats are shutting down schools.
News that the FBI arrested a National Security Agency contractor for stealing classified material is prompting questions about the agency's internal security after the Edward Snowden leaks in 2013.
The presidential campaign has gone nuclear. A hacked recording of a Hillary Clinton fundraiser reveals her questioning a program putting nuclear warheads on cruise missiles. A question about the nuclear triad seemed to stump Donald Trump. And a very expensive nuclear stockpile modernization plan awaits whoever wins in November.
The Chicago City Council approved a new oversight agency to investigate police shootings, though critics say the measure lacks transparency and shows that the city is still not ready for reform.
A new museum exhibition highlights the vast diversity of Chinese regional cuisines. It features not just celebrity chefs but also immigrant home cooks, for whom the kitchen can be a sphere of comfort.