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To curb diabetes, Mexico is trying to get people to cut down on soda, eat more healthful foods and exercise. But changing people's habits is easier said than done.

Journalist Paul Salopek is setting out from Ethiopia on a 21,000-mile walking tour that will follow the migration path of the earliest humans. But the story, he says, is about where the world is headed, not where it's been.

High school math teacher Jake Scott teaches his students with the help of his hip-hop alias, 2 Pi. By rapping about equations and formulas, Scott helps students remember his lessons and forges a deeper connection with them.

Venezuelan President Hugo Chavez is scheduled to be sworn in for a fourth term on Thursday, but he remains in Cuba undergoing treatment for cancer. In a very loose interpretation of the constitution, the government is prepared to inaugurate him later. The opposition says the constitution is being violated.

Vaccination is still the best way to avoid getting sick, but it's not 100 percent protective. Some people may get infected with a strain of flu that isn't covered by this year's vaccine. For others, the shots just don't work.

President Hamid Karzai is in Washington this week for meetings with President Obama and other officials. One of the key issues to be discussed is the number of American troops to remain in Afghanistan after 2014, when the bulk of U.S. and NATO forces leave.

As more and more Web users turn to streaming video services like YouTube, a new study shows how impatient those users are. The first of its kind, the UMass study suggests load times of more than 10 seconds can drive away more than 50 percent of viewers.

In Ethiopia, there's a saying in rural areas: "A man without a donkey is a donkey." Donkeys are both a livelihood and a lifesaver for farmers, and when they fall sick, there are special donkey hospitals to treat them.

Easter's coming up — a special time of year for fast-food ads pitching their fish offerings. Arby's, Burger King and regional chains like Carl's Jr. are trying to net hungry Catholic customers who've given up meat for Lent.

Journalist Susan Spencer-Wendel was diagnosed with Lou Gehrig's disease in 2011. In her new memoir, Until I Say Good-Bye, she describes a year spent living with the disease but devoted to joy: traveling, visiting friends and family, and accepting her fate with grace.