Cholera has killed hundreds of Zimbabweans...and infected thousands. Anchor Lisa Mullins finds out more about the disease from Rita Colwell, a cholera expert at the University of Maryland, College Park.

A South African design team has come up with a plan for building affordable housing -- using sandbags. But the houses may still cost more than the South African government can afford. Correspondent Terry Fitzpatrick reports from Cape Town.

The World's Aaron Schachter takes a look at efforts in Lebanon to transform the country's 40-year-old electoral system.

Our daily geography puzzler.

The answer to today's Geo Quiz is the Colombian state of Boyaca. It's home to the national sport of tejo popular among Colombia's indigenous people. Stephen Dudley reports that the game resembles a cross between horseshoes and a raucous 4th of July party.

The World's Marco Werman has details on the 15-year sentence handed to Rwandan singer Simon Bikindi for his role in the country's 1994 genocide.

Today on The World: Climate change as a national security concern for the incoming Obama administration; Also, the challenges facing car makers go beyond U.S. borders; and an unfortunate twist in the saga of Germany's most famous polar bear, Knut.

President-elect Obama introduced his national security team this week and climate change was mentioned prominently. The World's Jason Margolis examines how national security and the problem of global warming are linked.

President-elect Obama may have to give up his BlackBerry for national security reasons. Anchor Marco Werman talks with The World's Clark Boyd about other world leaders who love their technology.

Last week's attacks on Mumbai have been referred to by some as "India's 9/11." The World's Alex Gallafent reports there's some concern about the widespread use of the term "9/11."