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Celia Hatton gets caught out in Beijing, when she find nobody wants to be paid in cash anymore - but is the rise of mobile payments about convenience or control?

Turkey has emerged as one of the 21st Century's global players, occupying an area of increasing importance - both geographically and politically. For journalists based there it鈥檚 been a busy time. As he prepares to leave, our correspondent Mark Lowen reflects on the 5 years he has spent reporting from Istanbul and beyond.

The Arctic is home to several indigenous tribes, spread out across different countries and continents - but despite the borders which separate them, their culture and experiences are often shared. Juliet Rix travels to the far east of Russia, where she finds a community trying to reconcile tradition with modern-life.

'Gravity biking' is not for the faint-hearted. Increasingly popular in Colombia鈥檚 second city, Medell铆n, it involves hurtling down precipitous mountain roads on specially-modified push bikes, zooming in and out of traffic. Simon Maybin meets a group of 'gravitosos' and finds a complicated relationship with death.