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Two suicide attackers disguised as Afghan soldiers detonated an explosive in Farah province. At the same time, the country's intelligence chief returned to the country from the United States, where he was recovering from an assassination attempt.

The approach taken by Sen. Mary Landrieu's first official Republican rival, Rep. Bill Cassidy, in his announcement video is worth noting. Whoever eventually wins the GOP nomination to oppose the three-term Democratic senator could very well use the same playbook.

The United States and Russia have been at odds over human rights, Syria and even the adoption of Russian orphans by American families. But former U.S. envoys who met with officials in Moscow this week say they found "a willingness to explore ideas" and urged cooperation on economic and security issues.

Social networks now hold tremendous power to regulate online speech. Their rules for allowable comments, art and video govern billions of posts worldwide each day. And while Twitter users enjoy a great deal of freedom, Facebook has relatively tight restrictions on what users can say and see.

It's easy to see why a rocket scientist's obituary that led with a mention of her culinary prowess set off accusations of sexism. But food is undeniably a powerful marker of identity, as much or more of a statement of who we are as what we do for a living.

The finding could be a milestone in the decades-long search for the universe's missing material. But some scientists urge caution, saying it's possible the particles seen by the sensor on the International Space Station could have come from somewhere else.

Rumors abound of a major shakeup in the works for U.S. food aid programs. The U.S. would give aid groups money to buy food wherever they could get it cheapest and quickest, rather than shipping abroad commodities bought in the U.S. Already, groups that profit from the current system are mounting a fight.

South Korea's defense minister says the missile could have been moved for testing or for drills, and that there's no sign of military mobilizations that could suggest preparations for a full-scale conflict.

Also: Mark Twain's advice to little girls; Benjamin Lytal on Vladimir Nabokov; and author and screenwriter Ruth Prawer Jhabvala has died.

The fallen superstar has been banned for life from most competitions because of doping charges. The U.S. Anti-Doping Agency's reach doesn't extend to U.S. Masters Swimming. But swimming's international authority objected to his planned participation. Then, Armstrong withdrew.