Last week, internet activists calling themselves “Anonymous” temporarily brought down the Australian governments’ networks and they’re threatening to do it again. Anonymous, a “hacktivist” group, formed through the subculture website 4Chan. Jon Stewart speaks to 4Chan’s founder Chris “Moot” Poole. As the cyber threat increases, can cyber-security keep up? The BBC’s New York reporter, Laura Sheeter, looks at the various degree programmes emerging to fight the internet hackers. As the Mobile World Congress in Barcelona gets underway the BBC’s Rory Cellan-Jones reports on Microsoft’s latest salvo across the mobile industry, the Windows Phone 7 series, the fifteen dollar mobile phones and he tries out Google’s new Buzz. Finally, Gareth rings artistic digital bells at the Kinetica art Fair. Show less