Prior to world leaders gathering Sunday at the NATO summit in Chicago, President Obama sat down to discuss what is sure to be one of the hot-button topics of the weekend: Afghanistan. In a meeting with Afghanistan President Hamid Karzai, Obama warned of “hard days” ahead for the combative nation, detailing the next steps to come in the Middle East. The president said that the end of the war there is in sight, but that American forces “have a lot of work to do” prior to a 2014 handoff to the Afghans. Some 130,000 foreign troops are currently based in Afghanistan, mostly working to fight a Taliban-led insurgency. “There will be no rush for the exits, NATO Secretary General Anders Fogh Rasmussen assured, echoing Obama’s sentiment.

After years of back and forth, Web giant Yahoo has agreed to sell back its a portion of its shares in the Chinese Internet company for $7.1 billion. Yahoo will dump half of its 40 percent holding of Alibaba Group after years of negotiating. The deal is set to make money for Yahoo shareholders, as Alibaba is currently valued at $35 billion, but could rise significantly. Yahoo will use the deal to buy back a large number of shares in an attempt to revive its flagging stock price. Ross Levinsohn, Yahoo’s interim CEO, said the deal “reaffirms the significant” relationship with Alibaba.

Mitt Romney to the rescue? His former GOP challengers Rick Santorum and Newt Gingrich are both facing millions of dollars of campaign debt, and could be hoping to get help from the Republican party’s top dog. Santorum has debts totaling around $1 million, while Gingrich’s hover around an astounding $4 million. Tim Pawlenty, who dropped out of the GOP race after Iowa, had his campaign debt relieved by Romney after throwing his support behind the former Massachusetts governor. But such a deal could be harder for Santorum or Gingrich, whose supporters—especially those with deep pockets—have been hesitant to support the moderate Romney. Ron Paul, meanwhile, has maintained a balanced campaign budget, ending April with $2.5 million in the bank.

The former police chief who sparked one of China’s biggest political scandals will be put on trial for treason next month. Wang Lijun tried to take asylum in the U.S. Consulate in February after confronting aspiring leader Bo Xilai about his wife’s participation in the murder of a British businessman. Bo is under investigation and was suspended from the government. The South China Morning Post reports that “In a bid to have both cases wrapped up before the party congress, relevant departments are at present sparing no effort and racing against the clock.”

Though the stock exchange suffered some technical difficulties on the morning of Facebook’s highly anticipated public debut, Facebook’s stock was unaffected. Robert Greifeld, Nasdaq’s chief executive, says the delayed trading on some exchanges didn’t contribute to the stock price falling flat of expectations. Greifield says Nasdaq is “humbly embarrassed” by the problems, which left traders and investors unaware of the status of their orders until hours later, but says it did not influence Facebook’s stock prices.

Police and protesters clashed during an antiwar rally in Chicago as several thousand gathered near the meeting site of NATO dignitaries. The rally was intended to be peaceful, but protesters surged against riot police and at one point uprooted a metal barrier and tried to push it toward police. The protests drew to a close in the evening as rally organizers urged people to disperse, and police threatened to use water and other anti-riot measures against the crowd. President Obama and Afghan President Hamid Karzai met earlier in the day to discuss Afghanistan prior to the summit’s gathering of world leaders.

Daniel Elizondo, a leader of Mexico’s Zeta drug cartel who is known as “The Madman,” has been arrested as the suspected perpetrator of last week’s massacre that dumped 49 decapitated and dismembered bodies on the side of a highway near Monterrey. Zeta has been fighting for control of the area and a message left with the bodies and signed by the gang’s leaders read: “Gulf cartel, Sinaloa cartel, marines and soldiers, nobody can do anything against us or they will lose.” The victims haven’t been identified, but are thought to be migrants from Central or South America. Drug violence in Mexico has been intensifying in recent weeks, and it’s estimated that 55,000 people have been killed since 2006.

A rare annular eclipse started in Asia and is moving across the Pacific, set to dissipate over the state of Texas. The eclipse occurs when the moon passes between the Earth and sun at the farthest point of orbit, and making the sun appear as a thin ring around the dark moon. This is first solar eclipse visible in the U.S. since 1994 and viewing parties were organized across the country, from ski lifts to football stadiums. NASA ambassador Patrick Wiggins says he enjoys watching people's reactions. "You get everything from stoic, staring into the sky ... to people breaking down and crying, they're just so moved," he says. Experts warn not to look directly at the eclipse without eye protection.

In the auction world they call this, well... a home run! A jersey worn by Babe Ruth sold for a record-setting $4.4 million Sunday, surpassing the previous record in sports memorabilia. That belonged to the original document containing the rules of basketball, which was auctioned in 2010 for $4.3 million. “This proves again that Babe Ruth is ‘king’ in the sports memorabilia world,” auction expert David Kohler said. The gray jersey with “NEW YORK” emblazoned across the chest in blue also has Ruth’s initials on the inside collar, “Ruth, G.H.”

Robin Gibb, who co-founded musical group the Bee Gees with his two brothers, died Sunday at 62 years old. He had been battling liver and colon cancer for years, and although he had been recovering, a secondary tumor developed recently. The Bee Gees got their start in 1958, when Gibbs was just 9 years old, and ended in 2001 after the death of one brother. Robin and his son had recently premiered a collaboration called “The Titanic Requiem” in London with the Royal Philharmonic Orchestra.

Comedienne Kristen Wiig said her goodbyes to Saturday Night Live this week as the Bridesmaids star left for the next step in her career. The all-star sketch artist known for her expressive characters got choked up after being introduced by host Mick Jagger as one of the show’s “graduates.” She was then joined on the stage with her costars while Arcade Fire played covers of the Rolling Stones’ “She’s a Rainbow” and “Ruby Tuesday.” Producer Lorne Michaels was the last to say his goodbye to the Studio 8H player. Rumors have been floating around that costars Jason Sudeikis and Andy Samberg may also have plans to depart the “Not Ready for Primetime” crew, though NBC had declined to comment on whether the comedians may be leaving.

Two suspects have been identified in a Saturday school bombing that left at least one schoolgirl dead and six injured, officials announced Sunday. Official counts of those injured and killed have been inconsistent after the attack on a school for girls in Brindisi, Italy. Three gas cylinders were found hidden behind a trash container at the scene—they seem to have been detonated by remote control, officials said. The two suspects were reportedly caught on surveillance tape. “It’s an attack on all Italians, because schools are considered a secure area,” Fabiano Amati, regional minister for the country’s civil protection agency, told reporters. “It’s the first time in our country that a school is under attack.”

In a country where most women are illiterate and few will speak to men outside their family, Shakila Naderi has broken with convention by opening a driving school with the sole purpose of putting the fairer sex behind the wheel. “It bothers men when women drive,” the 45-year-old wife of a taxi driver told reporters. “But I wasn’t scared of them then, and I am not scared of them now.” After a decade under the cruel thumb of the Taliban, many Afghan women are still adjusting to their expanded education and work rights—but they still lag far behind men. The Naderi Driving School was the target of some threats, but Naderi is winning: 312 driver’s licenses were issued to women in Kabul last year.

All politics, and all political donations, are local. Twenty-two states and Washington, D.C., are taking a stand in a case in which Montana is asking that the Supreme Court’s controversial Citizens United ruling not be used to strike down state-level campaign-financing restrictions. New York is leading the charge, according to The Associated Press, filing a brief that asks the Supreme Court to keep Montana’s restrictions in place—the law is currently blocked by the court pending a decision on the case. A state court decided to uphold the restrictions, and the Supreme Court is being asked to reverse that decision. The states protesting the law have said they would like to court to rethink parts of its Citizens United decision, which has drawn widespread criticism since the ruling was made in 2010.

Sixty people were missing and as many as 19 are dead after waters from a flash flood swept through a town in Afghanistan, officials said Sunday. In Sar-e-Pul, a provincial capital, 1,000 houses were destroyed and 10,000 people were left without a place to go after the heavy seasonal flood, according to Sayed Faizullah Sadat, the local national disaster director. “Most of these families have lost their houses—all their property, their livelihoods,” Sadat said. Hundreds of people were recovered from their rooftops after water rose as high as 1.5 meters, according to the Afghanistan National Disaster Management Authority.

A roadside bomb exploded Sunday about 160 yards from a convoy carrying the head of the United Nations monitoring mission in Syria. Maj. Gen. Robert Mood was stopped at a checkpoint when an explosive device detonated nearby, causing no casualties, according to a Reuters journalist who witnessed the incident in the Syrian town of Douma. The convoy reportedly left the area immediately after the explosion.

It’s been quite the week for Mark Zuckerberg. On Monday the Facebook founder celebrated his 28th birthday, and on Friday he took his company public. One day later, the Facebook founder and Priscilla Chan wed in Palo Alto, Calif. The ceremony was held in Zuckerberg’s backyard with about 100 guests who all thought they were there to celebrate Chan’s recent graduation from medical school. Contrary to the lovelorn Zuckerberg portrayed in The Social Network, the two have been dating since they met at Harvard nine years ago.

President Obama and Afghan President Hamid Karzai will be among the world leaders gathering in Chicago Sunday for a NATO summit meeting on the war in Afghanistan. Topics of conversation will include preparations for elections in Afghanistan in 2014, when Karzai has said that he will not run for reelection after his term ends. For the moment, NATO peacekeeping forces are scheduled to leave the country in conjunction with the elections two years from now. The leaders of more than 50 countries were greeted by masses of protesters in Chicago, including members of the Occupy movement who accused police Saturday of hitting a demonstrator with a van.

From Land’s End to London, the Olympic flame will see most of jolly old England as a succession of runners carry the symbol of the Games through the country over the next several weeks. After starting off in the hands of sailor Ben Ainslie Saturday, 8,000 torchbearers will move the flambeau along as many miles until it ends up in London on July 27. The planners for this year’s Games decided not to hold an around-the-world relay, as was done in 2004 and 2008. Protesters hindered the progress of the torch as it circled toward Beijing in 2008. The torch will pass through England, Wales, Scotland, Northern Ireland, and Ireland on its journey, being carried by bike, horseback, helium balloon, and centenarian Diana Gould, who is scheduled to take the torch July 25.

How about just one more? I’ll Have Another took the Preakness on Saturday, racing past Bodemeister and on to a shot at the Triple Crown. If the 3-year-old can hold it together at the Belmont Stakes in less than a month, he’ll be the first to win the prize since 1978. “He’s a special horse,” said trainer Doug O’Neill after Saturday’s race. “We’ll see how he comes out of it, and if he comes out of it in good shape, we’re heading to New York, baby.” The Belmont, at 1.5 miles, is the longest of the three races of the Triple Crown, and since 1978 11 horses have won the Kentucky Derby and the Preakness only to go to pieces in the last leg.

Florida Sen. Marco Rubio jabbed President Obama Sunday, calling him the most “divisive” figure in recent American history. “The president and his party’s view of America’s government and our lives is a failed one,” said Rubio, widely considered a potential veep pick. “His ideas that sounded so good in the classrooms of Harvard and Yale haven’t really worked out well in the real world.” In his speech to 1,000 South Carolina Republicans, Rubio followed an attack line used frequently by presumptive GOP nominee Mitt Romney. South Carolina Sen. Jim DeMint introduced Rubio as a “voice for freedom,” and Sen. Lindsey Graham called the Florida lawmaker “the future of the Republican Party.”

Three men charged with making Molotov cocktails in preparation for this weekend’s NATO-summit protests in Chicago had plans to attack Obama’s campaign headquarters and Rahm Emanuel’s house, prosecutors said Saturday. The men were arrested in a raid Wednesday that defense attorneys say was nothing more than a scare tactic designed to quell protests planned around the meeting of world leaders in the city. “We believe this is all a setup and entrapment to the highest degree,” defense attorney Michael Deutsch told reporters.

Newark Mayor and Obama surrogate Cory Booker critiqued that campaign’s efforts to attack Mitt Romney’s career at the private equity firm he founded. “This kind of stuff is nauseating to me on both sides,” Booker said in an appearance on Meet the Press Sunday morning. “It’s nauseating to the American public. Enough is enough. Stop attacking private equity. Stop attacking Jeremiah Wright. This stuff has got to stop.” Booker went on to call the mediasphere squabbling a “distraction from the real issues,” saying that Obama’s reelection effort can instead be about “the issues the American public cares about.”

Seven people were killed by falling debris after an earthquake about 20 miles from Bologna, Italy, on Sunday. Two or more additional people may have been killed in the magnitude-6.0 quake in the historic northern Italian towns. The quake caused a ceramics factory to collapse in the town of Sant’Agostino and shook down the roof of a foundry in Tecopress di Dosso. Fifty or more people were injured in the disaster, reports said, as emergency officials rushed to the affected areas. It was the most serious quake to rattle the country since a 2009 tremor in L’Aquila that claimed almost 300 lives.

Pakistan blocked access to Twitter on Sunday after the social network would not take down messages related to a competition involving pictures of the Prophet Muhammad. “We have been negotiating with them until last night, but they did not agree to remove the stuff, so we had to block it,” Mohammad Yaseen, chairman of the Pakistan Telecommunication Authority, told reporters. Depictions of the Prophet Mohammad are considered blasphemous by many Muslims. Some Pakistanis were able to continue to use Twitter on Sunday by using location-hiding programs. Nadeem Paracha, a columnist in the country, tweeted that the move was “another cheap moral stunt by Pakistan.”

Abdelbaset al-Megrahi, convicted in the 1988 Lockerbie bombing, died in Libya on Sunday at age 60, according to his brother. Two hundred seventy people were killed in the attack, and in 2001 Megrahi was convicted by a court in the Netherlands. In 2009 he was released from Scottish prison after a cancer diagnosis gave the bomber months to live. Upon returning to his home country of Libya, Megrahi was welcomed by then-ruler Muammar Gaddafi. Despite calls for the bomber to be extradited to the United States or the United Kingdom, leaders refused after toppling the dictator.

Russia’s Deputy Foreign Minister Sergei Ryabkov told reporters Sunday that some Western countries are still considering military action against Iran in order to neutralize its nuclear program. Ryabkov, who was leaving the G8 summit at Camp David when he made the comments, voiced Russia’s opposition to such a plan, saying, “We are very worried about this. We do not want the region and the world to fall into ... new divisions and bitter political arguments.” Iran has denied enriching uranium to make warheads, but the international community has been suspicious. Tougher sanctions on Iranian oil by the U.S. and European countries will be coming into play this summer, and leaders discussed tapping into emergency stockpiles if necessary.