Chibok Girls Freed

At least 80 girls abducted by extremist Islamist Boko Haram in 2014 have been freed, according to the Nigerian government. The office of the Nigerian president said an unspecified number of Boko Haram suspects were exchanged as part of the deal.

Also in the programme: Running up a Taiwanese skyscraper; The letters of Harper Lee.

(Image: A still from a video of some of the girls from the village of Chibok being held captive by Nigerian Islamist extremist group Boko Haram. The still is dated 12th May 2014. Credit: AFP/Getty Images)