Colombia's second largest city was once dominated by the drug cartel of Pablo Escobar. Crime remains high. Which is why several groups in the city are determined to provide peaceful alternatives for young people through art and music.
SÃ£o Paulo-based rapper Kleber Gomes is known throughout Brazil simply as Criolo. He started from humble beginnings, but these days he's making hip-hop that's reaching a whole generation of young Brazilians.
After an eight month journey into space, NASA's most ambitious rover robot is due to land on Mars Sunday night. Anchor Aaron Schachter talks to Mars Science Laboratory Project Chief Engineer Miguel San Martin.
Ethanol has largely fizzled here in the US. But in Brazil, people have been driving their cars for years powered only by sugarcane ethanol. In recent years though, ethanol in Brazil has hit a speed bump.