Mark Memmott, NPR

The news that broke Sunday is now official.

Yahoo confirmed early Monday morning that it is buying Tumblr in a deal worth about $1.1 billion. "Per the agreement and our promise not to screw it up, Tumblr will be independently operated as a separate business," Yahoo added.

In its statement announcing the deal, Yahoo says that:

Update at 5:38 p.m. ET. One More IRS Official To Leave

Another official is out at the embattled agency.

The Associated Press reports that Joseph Grant, commissioner of the IRS' tax exempt and government entities division, will retire June 3. The division scrutinized Tea Party groups when the applied for tax-exempt status.

Update at 4:45 p.m. ET. Obama Names New IRS Acting Chief

In a message written on a wall of the boat where he was found hiding, Boston bombings suspect Dzhokhar Tsarnaev claimed responsibility for the attack and said it was motivated by anger over the Afghan and Iraq wars, sources familiar with what was found have told CBS News correspondent John Miller.

"A massive emergency response" is underway in North Texas, where tornadoes blew through Wednesday night, The Dallas Morning News says. A twister that hit Granbury, about 35 miles southwest of Fort Worth, left at least six people dead, more than 100 injured and even more homeless, The Associated Press adds.

All branches of the U.S. military have been ordered "to retrain, re-credential and rescreen all sexual assault prevention and response personnel and military recruiters," the Pentagon confirmed Wednesday morning.

Make no mistake, the acting commissioner of the IRS put himself in historic company Tuesday by writing in USA Today that "mistakes were made" when his agency singled out for extra scrut

Saying she is "writing about it now because I hope that other women can benefit from my experience," actress Angelina Jolie reveals on the op-ed pages of The New York Times that she had a double mastectomy earlier this year to substantially reduce the chances she will develop breast cancer.

Republican questions about how and when changes were made to his administration's "talking points" about last September's attack on the U.S. Consulate in Benghazi, Libya, are a "sideshow," President Obama told reporters at the White House on Monday.

"There's no there, there," the president declared.

"What we have been clear about throughout," Obama insisted, is that "we were not clear who exactly had carried this out."

A unanimous Supreme Court ruled Monday that an Indiana farmer infringed on Monsanto's patent when he planted soybeans that had been genetically modified by Monsanto without buying them from the agribusiness giant.

Minutes ago, just as we were reading a Forbes story headlined "3D-Printed Gun's Blueprints Downloaded 100,000 Times In Two Days," this message appeared on the Twitter page of the group that has made those plans available to the world:

America's unlikeliest link to North Korean leader Kim Jong Un has reached out to his friend in a bid to have an American citizen released from one of the communist nation's notorious labor camps.

"I'm calling on the Supreme Leader of North Korea or as I call him 'Kim', to do me a solid and cut Kenneth Bae loose," former basketball star Dennis Rodman tweets.

Ray Harryhausen, who brought sword-fighting skeletons to the 1963 movie Jason and the Argonauts and was known as the master of stop-motion animation for his work on that and other films such as Clash of the Titans and The Golden Voyage of Sinbad, has died.

This is a post for everyone (like us) who tunes into horse racing just once a year, on the first Saturday in May when the Kentucky Derby is run. Here are three horses that those who pay much closer attention say you should know about:

(Most recent update: 10 a.m. ET.)

The nation's jobless rate edged down to 7.5 percent in April from 7.6 percent in March and employers added 165,000 jobs to their payrolls last month, the Bureau of Labor Statistics reported Friday morning.