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Hillary Clinton formally resigned as the 67th secretary of state, just moments ago.

In a letter to President Obama, she said it was an "honor to serve."

"I am more convinced than ever in the strength and staying power of America's global leadership and our capacity to be a force for good in the world," she said.

She concluded, "On a personal note, it has been a pleasure to work with you and your team. Thank you, Mr. President, for your friendship, and for the opportunity to serve in your Cabinet."

Former Massachusetts Sen. Scott Brown will not seek the Republican nomination for Senate in a special election to replace Sen. John Kerry, the Democrat who on Friday was being sworn in as secretary of state.

The decision leaves Republicans in deep blue Massachusetts scrambling to find a candidate who can be competitive in a special election just five months away.

Brown, who won a 2010 special election for the seat of the late Sen. Edward Kennedy, lost the seat in November to Democrat Elizabeth Warren.

For those of you who keep up with the details of Washington machinations. Here's a bit of surprising news: The next Secretary of State John Kerry told The Boston Globe that President Obama offered him the State gig a week before U.N. Ambassador Susan Rice removed her name from consideration.

The iconic black cabs of London got a lift Friday when a Chinese company rescued the British automaker that manufactures the taxis. Zhejiang Geely Holding Group said it will pay $17.5 million to buy Manganese Bronze Holdings, which has been making the cabs since 1899.

Has the recession made you fat?

To the long and growing list of risk factors known to increase the risk of obesity, scientists recently added a new one: scarcity.

People given subtle cues that they may have to confront harsh conditions in the near future choose to eat higher-calorie food than they might do otherwise, a response that researchers believe is shaped by the long hand of evolution.

The winter may not be over, but economists are looking to spring for good news when it comes to jobs. Host Michel Martin speaks with NPR Senior Business Editor Marilyn Geewax about whether a strengthening housing market could boost stalling jobs numbers.

Energy Secretary Steven Chu will resign once his replacement has been confirmed.

Politico, which broke the news this morning, reports that Chu made the announcement in a memo to colleagues.

Politico adds:

Transcript

IRA FLATOW, HOST:

Up next, Flora Lichtman is here with Video Pick of the Week, fresh from being the recent winner of the Cyberscreen Film Festival. Well, congratulations, Flora.

FLORA LICHTMAN, BYLINE: Oh, thank you, Ira.

FLATOW: It was for optical illusion piece.

LICHTMAN: Yes. Step into an optical illusion was the winner. Thank you. But, really, I mean, I'm still stuck on dung beetles.

(LAUGHTER)