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As the debate on guns heats up, there is one thing we can all be certain of: Lots of statistics will be thrown about.

On this blog, we've already pointed to a Department of Homeland Security study on commonalities in mass shootings.

Today, we'll point you a study commissioned by Mayors Against Illegal Guns. As the name implies, the group led by New York City Mayor Michael Bloomberg is advocating for stronger gun control laws.

A few years ago, before "CTE" was as much a part of football conversations as "quarterback rating" or "wild card spot," I had a conversation with some friends about unsettling news stories that linked the sport to brain injury.

As we spoke, an avowed hater of sports piped up. "Football, as it's currently played, is completely indefensible," she said.

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.