Why do we say sorry – and what do we really mean by it?
What is it like to live with the threat of Boko Haram and the Nigerian military?
The dilemmas faced by charities trying to help people in areas run by militant groups
Why are we so drawn to symbols of statehood, and how can leaders use that loyalty?
How Iraqi insurgents use social media to amplify their message and gain global support
The families who depend on Mt Everest for their livelihoods
Why is making eye contact so important?
Why 'Kenya's Kim Kardashian' prompted a worldwide debate on skin bleaching
Mike Williams asks why the fool or jester has been an important figure in many cultures
Why do humans kiss?