Iowa caucus: Romney ekes out 8-vote win over Santorum

As Venezuela's presidential campaign kicks off, Hugo Chavez's legacy lives on in many towns. We take you to Ciudad Caribia, the country's biggest social housing project. Next, we go to the Amazon rainforest where an indigenous tribe is at risk because of construction work on a new dam. Finally, in the United States, small airports are already feeling Washington's stringent budget cuts.

Latin Americans are celebrating the historic election of the first pontiff from the region, especially those from Pope Francis' hometown of Buenos Aires - our correspondent reports. Next, we look at how the Panama Canal, merely the width of the River Seine in Paris, is being enlarged in order to allow supertankers through. Finally, we discover how social media has shone the spotlight on a rape case that has gripped and shocked the United States.