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When Stanford professor Andrew Ng put one of his classes online, more than 100,000 students signed up. Now he's co-founded a company, Coursera, with the potential to give millions of students free access to classes from Stanford, Princeton, the University of Pennsylvania and other schools.

Fighting childhood obesity is both a personal and a public mission for first lady Michelle Obama. She has rethought her daughters' diets, and she launched the Let's Move! initiative to encourage more healthful lifestyles. She talks about ways to get children to eat well, and her new book, American Grown.

In the Washington Post, Isabel Sawhill argued then-Vice President Dan Quayle was right when he blasted Murphy Brown for encouraging single motherhood. Sawhill, of the Brookings Institution, and Philip Cohen, sociology professor at the University of Maryland, talk about single motherhood.

After meeting with American sisters, the Vatican did not back down from its admonitions saying the sisters must promote the church teachings.

Shellie Zimmerman is accused of lying during her husband's bond hearing.

Researchers have found traces of HIV virus in the cells of the first man who was cured of the infection with bone marrow transplants. It raises fresh questions about how to define a cure for HIV/AIDS.

Moammar Gadhafi suppressed everyone who posed a potential threat, including Islamists. Today, Islamists are vying with secular groups for supremacy in post-Gadhafi Libya. Derna, outside Benghazi in eastern Libya, is one of the battlefields.

The federal government promised almost 30 years ago to find a place to bury nuclear waste from power plants. It hasn't. So 70,000 tons of waste is piling up at power plants around the country, and a federal appeals court has told the government it needs to prove the temporary solution is truly safe.

Burger King recently added smoothies and more wraps and salads to its menus. Its latest creation doesn't seem to fit the trend: a bacon sundae. The food chain claims the concoction of vanilla soft serve, fudge, caramel, bacon crumbles — oh, and a strip of bacon — weighs in at a whopping 510 calories.

Voters in Southern Arizona decided Tuesday who will replace former U.S. Rep. Gabrielle Giffords for the remainder of her term: her former district director, Ron Barber. Giffords resigned from Congress in January to focus on recovery from injuries she suffered in a shooting in early 2011. Barber was also injured. His Republican opponent, Tucson businessman Jesse Kelly, narrowly lost to Giffords two years ago.