Protesters gathering in Chicago for the NATO summit were gearing up for their largest demonstration Sunday, when thousands are expected to march from a downtown park to the lakeside convention center where President Barack Obama and dozens of other world leaders will meet.

Massachusetts Republicans Mitt Romney and Scott Brown have a history of supporting each other throughout their political careers.

Tropical Storm Alberto emerged off South Carolina's coastline Sunday, the first storm of its kind to form in a hurricane season that doesn't officially begin until June 1.

WASHINGTON (Reuters) - If or when policymakers finally decide Greece should leave the euro, the exit could happen so quickly that "new drachma" currency notes might not be printed in time. In principle, some of the long-term consequences of Athens leaving the currency bloc are not unappealing. The euro zone would no longer have to worry about what has always been its weakest link. While a new Greek currency would almost certainly immediately crash in value as soon as it was issued, in doing so it would make the Greek economy much more competitive. ...

Pakistan blocked Twitter on Sunday, saying the website had refused to remove posts promoting a Facebook competition involving caricatures of the Prophet Mohammed.

After 50 years of searching, physicists have spotted the fingerprint of radioactive plutonium, revealing the secrets of this complex molecule behind nuclear weapons.

Mark Zuckerberg got married, everyone! A day after taking Facebook public, Zuck tied the knot with his longtime girlfriend Priscilla Chan and announced it the only way he knows how: through his Facebook timeline. 

A roadside bomb exploded in a restive suburb of the Syrian capital as senior U.N. officials toured the area on Sunday, blowing off the front of a parked vehicle but causing no casualties.

TRIPOLI (Reuters) - The former Libyan intelligence officer convicted of the 1988 bombing of a Pan Am flight over Lockerbie, Scotland, that killed 270 people has died, his brother said on Sunday. He was 59. Abdel Basset al-Megrahi died at home after a long battle with cancer. His health had deteriorated quickly overnight, his brother Abdulhakim told Reuters. "He was surrounded by his family and died in his house," Abdulhakim said on Sunday. Megrahi had been in and out of hospital for weeks and he was taken for an emergency blood transfusion in April. ...

Twenty-two states and the District of Columbia are backing Montana in its fight to prevent the U.S. Supreme Court's 2010 Citizens United decision from being used to strike down state laws restricting corporate ...

House Democratic Leader Nancy Pelosi defended the Democratic Congressional Campaign Committee on "This Week" for sending a fundraising email that attempted to capitalize on the apparently dead advertising plan to link President Obama to Rev. Jeremiah Wright.

One of the worst quakes to hit northeast Italy in hundreds of years rattled the region around Bologna early Sunday, killing at least four people, collapsing factories and sending residents running out into the streets, emergency services said.

House Speaker John Boehner, R-Ohio, stood by his call insisting that any increase in the debt limit should be offset by greater cuts in spending and tax reform before the end of the year, saying that working toward an agreement now would improve the economy.

SEOUL (Reuters) - Samsung Electronics' mobile division chief JK Shin said on Sunday the South Korean technology giant was still seeking to resolve differences in its international patent war with Apple Inc.. "There is still a big gap in the patent war with Apple but we still have several negotiation options including cross-licensing," Shin told reporters at Seoul airport shortly before his departure for the United States. Asked about the prospects for Samsung's memory chip business, Shin said the 4G chip shortage was expected to continue until early in the fourth quarter of this year. ...

A blind Chinese legal activist who escaped house arrest, endured a nearly monthlong diplomatic tussle and a hurried daylong flight paused ever so briefly upon his arrival in New York City before taking up a familiar fight.

For Facebook founder and CEO Mark Zuckerberg, it was quite a week — from birthday, to IPO, to I DO.

For Facebook founder and CEO Mark Zuckerberg, it was quite a week — from birthday, to IPO, to I DO.

Kristen Wiig got a musical sendoff on the season finale of "Saturday Night Live" as the popular and versatile cast member made her exit after seven years.

Confronting an economic crisis that threatens them all, President Barack Obama and leaders of other world powers on Saturday declared that their governments must both spark growth and cut the debt that has crippled the European continent and put investors worldwide on edge.

A day after the historic Facebook IPO, founder and CEO Mark Zuckerberg updated his status Saturday to "married."

Facebook founder and CEO Mark Zuckerberg updated his status to "married" on Saturday.

(Reuters) - Google said on Saturday that Chinese authorities have approved its $12.5 billion purchase of Motorola Mobility Holdings, the last regulatory hurdle to a deal that would allow the world's No. 1 Internet search engine to develop its own line of smart phones. Google, which will be the newest entrant to the handset market, announced plans for the acquisition last year in a bid to secure Motorola's valuable patents and pave the way for a pairing of Google's Android mobile software and Motorola's handset business. U.S. ...

A watchful eye has arrived on San Francisco's bar scene, but not to keep you in check. It just wants to check you out.

A watchful eye has arrived on San Francisco's bar scene, but not to keep you in check. It just wants to check you out.

The western United States and eastern Asia will be treated this weekend to a rare solar spectacle when the moon slides across the sun, creating a "ring of fire."

Authorities in China have approved Google Inc.'s bid to buy phone maker Motorola Mobility, clearing the way for the $12.5 billion deal to close early next week.

Authorities in China have approved Google Inc.'s bid to buy phone maker Motorola Mobility, clearing the way for the $12.5 billion deal to close early next week.

(Reuters) - Google said on Saturday that Chinese authorities have approved its $12.5 billion purchase of Motorola Mobility Holdings, the last regulatory hurdle to a deal that would allow the world's No. 1 Internet search engine to develop its own line of smart phones. Google, which will be the newest entrant to the handset market, announced plans for the acquisition last year in a bid to secure Motorola's valuable patents and pave the way for a pairing of Google's Android mobile software and Motorola's handset business. U.S. ...