For all that investigators have learned about the San Bernardino terrorist attack, a mystery persists: How did Syed Rizwan Farook and his wife Tashfeen Malik—a couple with an infant, an American family, and, in the father’s case, a reputation as an easygoing colleague—maintain a hidden life as terrorists-to-be? Who did they deceive and how?

Terrorism has emerged as the top concern among Republican primary voters, and Donald Trump is seen as the candidate best equipped to combat it. This is the main reason Trump has popped in the polls since his call last week for a temporary ban on Muslim immigration into the United States.

As he readies for tonight’s debate, Donald Trump’s improbable march to the GOP nomination could hit stumbling blocks in the early-state primaries, where his base is unproven and social conservatives are gravitating toward his biggest competitor, political watchers warn.

Scientists trying to untangle the human evolutionary family’s ancient secrets welcomed a new set of tantalizing and controversial finds this year. A series of fossil discoveries offered potentially important insights into the origins of the human genus, Homo. Most notably, a group of South African fossils triggered widespread excitement accompanied by head-scratching and vigorous debate.

The organizations America's Voice and Latino Decisions on Monday announced a project that will seek to mobilize Latino voters in 10 key states with an eye toward helping the Democrats recover control of the Senate in 2016.

A pro-immigration group says Latinos could help decide next year's U.S. Senate contest in Wisconsin.

Iowa, New Hampshire and South Carolina are getting more publicity, but it's a good bet that a fourth state will play a pivotal role in the 2016 Republican presidential race.

Sometimes readers of poetry wish for a poetry decoder ring. Some useful ornament to slip on a finger to help one figure out what bards mean in their mysterious verse, from Ezra Pound to William Blake to Nobel-winning poet Tomas Transtromer.

If you want a date, maybe you should get a dog, first.

Credit — or, maybe, blame — Bill Cosby's sweaters on "The Cosby Show" or Chevy Chase's sweaters in "National Lampoon's Christmas Vacation," or every dad, brother, uncle or grandfather who ever felt compelled to don his most questionable apparel to seek a few laughs on the holiday party circuit.

Coalition A.S. Color presents our second interview as part of our Out of Line Series. In this interview Veronica Miranda reconnects with a high school classmate, Gloria Wong-Padoongpatt, to discuss her experiences in grad school and her most recent research on microaggressions.

It was the tweet that made the GOP tremble.