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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.