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The Republican presidential candidates are in Las Vegas for their latest debate, the first since terrorist attacks in Paris and California refocused the campaign on national security.

A small group of Syrian refugees has arrived in Tennessee. A top Republican lawmaker there has called for the state's National Guard to remove them and prevent new refugees from entering the state.

Online payment startup Square and online dating giant Match have gone public. Their lackluster prices are the latest sign of Wall Street growing weary of tech hype and multibillion-dollar "unicorns."

More than 100 Russian athletes were banned from the Rio Olympics. Rachel Martin speaks to German TV journalist Hajo Seppelt, who helped break the story of the program in Russia in a documentary.

Earthworms are a source of protein, calcium and much more. But they may not be the top option for feeding a hungry world.

Alex Honnold has scaled the sheer face of Half Dome in Yosemite, Calif., without the aid of ropes — and entirely alone. Still, he says his big break didn't arrive until a TV producer approached him.

Service dogs help veterans with physical disabilities, and there's increased interest in using dogs for symptoms of post-traumatic stress disorder, too. A study is underway to see whether that helps.

Sen. Angus King, of Maine, is in Europe with other members of the Senate Intelligence Committee members on a national security-focused delegation. The attacks in Brussels are now a top priority.

The Mast Brothers have been called the "celebrity hipster chocolatiers" of Brooklyn. Lately, they've been accused of defrauding their customers. But that depends on how their chocolate tastes to you.

Trump said Friday that he would not sign a House GOP immigration bill crafted to meet his policy demands, triggering confusion. Later, a White House spokesman said the president backed the measure.