Picasso oil painting goes for $179m at auction
Cyborg beetles to the rescue
"It’s Obama on the phone!": US president makes surprise Mother’s day calls
Heli-drone could help search and rescue efforts
Yemen humanitarian truce under threat from intense border clashes
Nepal in need of most basic necessities
Russia holds largest Victory Day parade to date
Mubarak sentenced to three years in jail for corruption
The tower, which is slated to be the tallest in the world when complete in 2018, has reached floor 14