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Two days after finishing second in Iowa, Donald Trump is now alleging that winner Ted Cruz cheated and is threatening to sue over the results.

The confrontational billionaire made his complaints known in his usual way — a series of tweets. The crux of his complaint: the Texas senator's campaign committed "fraud" when it informed caucusgoers of a CNN report that rival Ben Carson was leaving the campaign trail to head home to Florida after the Iowa caucuses, which many speculated meant he might drop out.

Last November, Amazon did the unthinkable for an online retailer known for undercutting brick-and-mortar bookstores: It opened a walk-in store in Seattle. Now, there's talk that Amazon plans hundreds of them.

On an investor call Tuesday, Sandeep Mathrani, CEO of mall operator General Growth Properties, said: "You've got Amazon opening bricks and mortar bookstores, and their goal is to open, as I understand, 300 to 400 bookstores."

"If you are a woman who is pregnant living in the U.S., there's one really important thing you need to know: You shouldn't go to a place that has Zika spreading."

Britain's Prime Minister David Cameron promised back in 2010 to bring net migration down to 100,000 people a year. Six years later, it's more than three times that number.

That's one reason the government's Home Office decided that non-Europeans on skilled worker visas — known as Tier 2 visas — are not welcome to stay unless they are making at least 35,000 British pounds (about $50,000 a year).

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Mice were much healthier and lived about 25 percent longer when scientists killed off a certain kind of cell that accumulates in the body with age.

What's more, the mice didn't seem to suffer any ill effects from losing their so-called senescent cells.

With New Hampshire's first-in-the-nation primary less than a week away, the publisher of the state's largest paper, the Union Leader, told NPR's Robert Siegel his assessment of how the Republican presidential race has played out thus far in a single word: "Extraordinary."

And the reason he describes the GOP campaign that way boils down to Donald Trump, who, despite coming in second in the Iowa caucuses this week, enjoys a double-digit advantage in most New Hampshire polls.

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