A look back in pictures at the career of actor and comedian Robin Williams, who has died aged 63.
One of the world's best known athletics coaches is at the centre of doping allegations, according to a BBC investigation.
Why do so many Chinese students choose US colleges?
A guide to terminology and avoiding pitfalls
Whatever happened to Psy?
How Saudi con artists used photos of sick American girl
Stunning colour photos of US history unearthed after 20 years
The babies Allied forces left behind in Germany and Austria
Other people's social media photos taken without permission and sold
The day my daughter was shot in front of me
The teachers who gave up work to get more time