Despatches from foreign correspondents. Today: Tim Whewell on what's caused the savage breakdown in law and order in the Central African Republic. As Afghans go to the polls, Lynne O'Donnell reflects on the daily threats they face from the Taliban. Ritula Shah in Gujarat on how there's cake for SOME Indians as their mammoth election approaches. Will Grant meets migrants in Mexico preparing for a dangerous and illegal desert trek into the United States and it's a literary mystery that's baffled the brilliant for more than a century - Simon Worrall's been to study the controversial Voynich Manuscript.