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The shooting in San Bernardino, Calif., was the 355th mass shooting in the U.S. so far this year, or a little more than one per day. And it wasn't even the only mass shooting on Wednesday.

It's official: A majority of U.S. homes only have mobile phones. But who knew wireless-only households were into risky behavior? A Centers for Disease Control and Prevention researcher explains.

Opened in 1865, Chicago's Union Stock Yard was the greatest livestock market the world had seen. Tourists watched masses of animals move through kill floors, a sight hailed as a miracle of modernity.

The chances for political action after the latest mass shooting are low. But the reaction was swift, with many on the left criticizing conservatives for turning solely to thoughts and prayers.

What if you could never get a good night's rest? Some low-income people around the world face that challenge. A team of researchers is investigating whether sleep deprivation keeps some in poverty.

Rachel speaks with Zoe Bedell about the Pentagon's decision to open up front-line combat posts to women. Bedell was a Marine captain and is a plaintiff in a lawsuit fighting the long-time Pentagon ban.

Jaafar Mohammed Saad and some of his aides were killed by a car bomb as he was headed to work. The Islamic State said they were responsible for the attack and said more attacks were planned.

"Average daily attendance" has long been a trusted measure, but the number conceals an important metric in identifying kids at risk of failing or dropping out: chronic absence.

Venezuelans voted amid an economic crisis that's led to soaring inflation and scarcity. Winning 99 seats, the opposition will now control the country's congress.

The World Health Organization projects an additional 250,000 deaths a year, starting in 2030, due to diseases like malaria and diarrhea.