Latest update: 26/01/2012
Republican primary: open season for negative ads
We catch up with the Republican presidential campaign, as the remaining candidates head to Florida where the attacks are getting increasingly personal. Plus, oil around the Falklands reignites an unresolved dispute between the UK and Argentina. Finally, Mexico City is losing its battle with garbage. We hold our noses and bring you a special report from one of the most crowded places on earth.