Swiss police arrest a number of officials from football world body Fifa over US corruption charges, the BBC learns.
The blog calling out gender imbalance on panels
The plan to send ice from the Alps to Antarctica
Ice skating in Havana's waterfront
Why Venezuelans now worry more about food than crime
Millions online follow supernatural craze - but it isn't what it seems.
Why do people waste so much time at the office?
The state-of-the-art hospital for poorly birds
Is the lorry driver of the future a piece of software?