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President Trump has announced that Army Lt. Gen. H.R. McMaster will be his new national security adviser. McMaster will replace retired Army Lt. Gen. Michael Flynn, who was forced to resign after revelations that he had misled top White House officials about his conversations with the Russian ambassador to the U.S.

President Robert Mugabe turns 93 on Tuesday, making him the oldest president in Africa — and the world. He's the only leader most Zimbabweans have ever known, spending nearly 37 years at the helm since independence from Britain and the end of white minority rule in Rhodesia in April 1980.

On Sunday, former Uber engineer Susan Fowler Rigetti published a post on her blog entitled "Reflecting On One Very, Very Strange Year At Uber." On her first day working on her new team at Uber, Rigetti says, her manager sent her a string of messages propositioning her on the company chat. She says she took screenshots of the conversations, and brought them to Uber's HR department, saying she expected the matter would be handled quickly and appropriately. And from her account, it was not.

Speaking at NATO headquarters in Brussels Monday, Vice President Mike Pence reassured allies that America would uphold its commitments to the organization, but added that President Trump expected "real progress" among NATO allies in stepping up their defense spending.

Defense Secretary James Mattis arrived in Iraq Monday on an unannounced visit that seemed aimed to reassure Iraqi allies. He told reporters that, despite President Trump's earlier statements to the contrary, the U.S. does not plan to seize Iraqi oil.

"All of us in America have generally paid for our gas and oil all along and I'm sure that we will continue to do so in the future," Mattis said. "We're not in Iraq to seize anybody's oil."

An "atmospheric river" is a colorful term for a sinuous plume of moisture that travels up from the tropics — a single plume can carry more water than the Mississippi River at its mouth. But new research shows that atmospheric rivers are also among the most damaging weather systems around.

The atmospheric rivers that soaked California this winter did some good — they ended an epic drought in the state.

Sitting inside a glass-encased cockpit, two men fiddle with joysticks controlling giant claws outside. They look like they're playing at a vending machine at a mall, where you try to grasp a stuffed animal. But these are engineers. The claws they're manipulating are as big as houses, and they're sifting through hundreds of tons of garbage thrown away by the world's largest consumer class.

About 13 years ago, The Alchemist brewery in Waterbury, Vt., released a new IPA called Heady Topper. The brewer, John Kimmich, had decided to neither filter nor pasteurize the beer — both common methods of extending a commercial beer's shelf life. The result was an IPA thicker with the microscopic compounds and particulates that add flavor and aroma. Customers noticed and praised the beer as being especially tasty.

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