Caitlin Alifirenka of Pennsylvania and Martin Ganda of Zimbabwe became best friends – and better people – through their exchange.
Mexico’s President-elect, Enrique Peña Nieto, will take office on Saturday and vows to change his country’s drug war strategy.
Outgoing President Felipe Calderón declared war on the cartels six years ago, and the fight has been devastating, claiming more than 40,000 lives.
Peña Nieto says he will downsize the federal police, which grew seven-fold under Calderon, but has been dogged by corruption allegations.
The BBC’s Will Grant reports.
Peter O’Dowd follows the route of Abraham Lincoln's funeral train 150 years ago, to look at modern-day race relations and Lincoln's legacy.