Why China's separatists are now unwelcome in Central Asia
Saving a woman's life after the Oklahoma bombing
How far can Russia's most daring theatre company go?
The filter bubble effect is limiting what news users of social media see about the General Election
When did the New York Times first explain pizza to its readers, and other news nuggets.
A county in China is punishing poorly-performing officials with military-style training camps.
The week's big numbers, visualised.
A collection of some of the best reads from the BBC News website this week.