Khalid Sheikh Mohammed and four alleged 9/11 co-conspirators faced a military tribunal at Guantánamo Bay on Saturday in what is their first public appearance in three years. The arraignment quickly devolved as the defendants did everything they could to disrupt proceedings. Mohammed refused to answer a judge's questions. A co-defendant, Walid bin Attash, was put in a restraint chair, but then was removed from it after he agreed to behave. The defendants are charged with 2,976 counts of murder.

A U.S. drone fired four missiles at a house in the North Waziristan region near the Afghan border, killing eight and injuring three Saturday. The targets of the strike were possible insurgents, and the targeted house was a training compound in an area known for its militant groups. Foreign Office spokesman Moazzam Ahmed Khan said the strike violates international laws and causes a trust deficit between Pakistan and U.S.

Voting begins Sunday morning in the second and final round of France’s presidential election, in which the socialist François Hollande leads President Nicolas Sarkozy by a narrow margin in the polls. Hollande came out of the first round of voting leading by just 2 percentage points. Both candidates appealed to supporters of the far-right Marine Le Pen, who took a surprising 20 percent of the vote in the first round. Hollande and Sarkozy dueled in a bitter three-hour debate last Wednesday that featured a colorful display of shouting and name-calling. The election has been closely watched by European leaders who fear Hollande’s promises to resist Germany-imposed austerity measures on the continent’s struggling nations. Hollande would be France’s first socialist president since 1988.

A car bomb exploded in the Syrian city of Aleppo leaving five dead early Sunday, in the latest sign that the U.N. peace treaty is crumbling. In Damascus, two explosions were heard, but there was no news on possible injuries. These recent bombings come after Syrian forces fired on protesters and killed four students at Aleppo University. It's unclear who was behind the car bombing, which took place at a car wash, and one activist said a group that carries out attacks against regime supporters was responsible.

After avoiding a near diplomatic crisis, Hillary Clinton has departed from Beijing, as Chinese activist Chen Guangcheng awaits approval to come to the United States. Guangcheng left his refuge in the U.S. Embassy on Wednesday and is still in the hospital recovering, though reportedly U.S. officials and his lawyer have not been allowed access to him. The Chinese government agreed to grant the activist a study abroad visa, and he has been offered a fellowship at New York University. Guangcheng's fate is still unclear, and some have criticized the U.S. response. "U.S. officials made a mistake by escorting Chen away from the safety of the U.S. Embassy and into an uncertain fate," said Ileana Ros-Lehtinen, the Republican chairman of the House of Representatives's Foreign Affairs Committee.

Get your tripods out. On Saturday night, the biggest and brightest full moon of 2012 will come out at 11:35 p.m., as the “supermoon” reaches its closest proximity to Earth this year. The effect of the moon’s perigee—rising only 221,802 miles from Earth—will result in unusually high and low tides this weekend and into next week. The moon will appear 30 percent brighter than other full moons this year. Last year’s supermoon came nearly 250 miles closer to the Earth than Saturday’s perigee will.

With 15–1 odds, I’ll Have Another, ridden by Mario Gutierrez, overtook Bodemeister in the 138th running of the Kentucky Derby. Dullahan came in third. The word “Another” appeared in the sky of Churchill Downs, as promised by the owner of rival horse Hansen.

In a move designed to appease anti-abortion advocates, Arizona Gov. Jan Brewer signed into law Friday a bill that cuts state taxpayer money to Planned Parenthood. Use of public funds for abortions is already restricted in most cases in the state, but the new law will ensure that taxpayer money isn’t going indirectly to support abortion services. Planned Parenthood Arizona has said that the funding cuts will endanger its other health services, including preventive health care for close to 20,000 women. Planned Parenthood said it is considering challenging the state law, which was passed by Arizona’s Republican-dominated legislature, in the courts.

They’re off! The Obama campaigning machine officially launched its reelection campaign Saturday as the president held his first rallies of the season at colleges in Columbus, Ohio, and Richmond, Va. Obama’s new campaign slogan, “Forward,” aims to highlight his progress and future goals for the economy, while taking a swipe at Romney policies that move backward. “I believe in you. I’m asking you to keep believing in me,” the president said to thunderous applause in Ohio. Romney has already jabbed back, telling a crowd in Virginia, “It’s like, forward, what? Over the cliff?”

The superhero flick The Avengers enjoyed the second-largest opening day ever on Friday, pulling in $80.5 million, That trails only Harry Potter and the Deathly Hallows: Part 2, which made $91.1 million on its first day. If all goes well, however, Disney’s comic-book adaptation may have another way to demonstrate that the film is the antithesis of John Carter: by beating the $169.2 million opening-weekend record set by the Potter movie. The Avengers features Scarlett Johansson and Samuel L. Jackson among its cast of do-gooders who team up to fight a villain intent on enslaving humanity.

Chen Guangcheng may be on his way out of China, but Katniss Everdeen can’t wait to get in. The heroine of Suzanne Collins’s Hunger Games young-adult trilogy will be making her way to screens in China after Lions Gate Entertainment got approval to show the film in the country. The movie has netted $603.5 million worldwide so far, a number that will grow, Lions Gates CEO Jon Feltheimer told reporters, as international awareness of the series grows. In recent years, China has become less restrictive about showing Western films and has become a major market for box-office sales, ranking third behind the United States and Japan in tickets sold.

He may have been portrayed in The Social Network as playing a naive second fiddle to Mark Zuckerberg, but Facebook co-founder Eduardo Saverin has found his own corner of the social and media worlds to inhabit—in Singapore, to be precise. According to a profile in The Wall Street Journal, the 30-year-old billionaire has settled into life in the Southeast Asian state nicely, driving a Bentley and achieving a sort of local celebrity as a socialite. He’s been referred to in magazines as among “Singapore’s hottest partygoers.” Saverin has continued to invest in both U.S. and Singapore-based companies, including Silicon Valley startups and a line of cosmetics started by a former Miss Universe contestant from Singapore.

Protests in Egypt on Friday ended in violence with one person dead and more than 300 injured. Demonstrators threw rocks at security forces, and water cannons were used to control crowds after Egyptians filled the streets to voice their frustration with the slow rate of reform in the country’s military-led government. The military has imposed a curfew on Abbasiya Square in the Cairo neighborhood where the demonstrations took place. Similar protests Wednesday led to 11 deaths and dozens of injuries. The Freedom and Justice Party, the political arm of the Muslim Brotherhood, has been active in the protests.

The Oracle of Omaha seems as prescient as ever as Warren Buffett's Berkshire Hathaway announced Friday that it had doubled its first-quarter profits over last year. The 81-year-old magnate’s holding company posted earnings of $3.25 billion for the first quarter, most of that driven by insurance and derivative companies among the more than 80 businesses Berkshire holds. Shareholders in the company will congregate in Nebraska on Saturday for Berkshire’s annual meeting, where the legendary investor will likely face questions about his plans for succession. Buffett, who was diagnosed with Stage 1 prostate cancer in April, has reportedly chosen his successor but has not yet named the person publicly.

Despite China’s announcement Friday that it would allow blind human-rights activist Chen Guangcheng to leave the country for the United States with his family, other critics of the Chinese government say they don’t expect to see much improvement in the country. “I think that after the Chen Guangcheng incident, the situation for us will just become worse and worse,” said a supporter of Chen’s who said he may have been assaulted by plainclothes police while going to see Chen in the hospital last week. Another activist, Liu Feiyue, said that Chen was lucky to have the U.S. step in to defend him. “Not all dissident cases can become international issues,” Feiyue said.

Some say they may be rivals later, but they’re friends for now. Prime Minister David Cameron had only nice things to say about Boris Johnson’s reelection as mayor of London, saying the vote turned out for the Tory politician “based on his record, on the excellent things he has done out there.” In an election that ended up closer than anyone thought it would, Johnson beat out Ken Livingstone for a second four-year term. Even Livingstone saw big things in Johnson’s future, saying in his concession speech that “this has also settled the question of the next Tory leadership election.”

Former President Bill Clinton has spoken out strongly against a proposed constitutional amendment in North Carolina that would define marriage as only between a man and a woman. Clinton released a robocall ad that will be pushed to hundreds of thousands of voters beginning Monday, saying the law will affect the state's ability to attract new businesses and will take away health care from children. He says it also could diminish the state's laws protecting women from domestic violence. The Rev. Billy Graham had earlier come out in support of the amendment.

Sorry ... What is Jeopardy! without Alex Trebek? The face and voice of the popular game show may be considering retirement after 28 years, according to the New York Post. The newspaper said that the 71-year-old Trebek told interviewers he was considering it, but may hang in for two more years so that he can say he hosted for 30 years. The Post reports that Trebek said: “A lot of people have been telling me, ‘Alex, you’ve got to go for at least 30. You’ve just done 28. Now at least do two more.’ So that has a nice ring to it. Put in your 30. And go help people.”

The bodies of 23 people were discovered in one of Mexico’s most violent border regions Friday. Some of them hanging from a bridge, or decapitated and dismembered in ice chests and garbage bags. Law enforcement could not immediately confirm who carried out the killings, though they said that it may have been an attack by the Zetas cartel on a rival. The bodies of five men and four women were found hanging from the bridge in Nuevo Laredo, while another 14 were found near the town’s police station. In a similar set of slayings last month, the dismembered bodies of 14 men were discovered near the Nuevo Laredo town hall.

Saturday may mark a new era in energy for Japan as the country powers down the last of its 50 nuclear reactors. Thousands of Japanese, waving fish-shaped banners, a symbol of the anti-nuclear movement, took to the streets to celebrate the shutting off of the Tomari nuclear power plant for maintenance. No plant shut off for maintenance since the earthquake and tsunami in March of last year has been turned back on. But many in the government are enthusiastic about restarting them, worried about the country’s increased reliance on oil and gas. Before the crisis last year and new restrictions passed to prevent against future disasters, more than 30 percent of Japan’s electricity was provided by nuclear plants.