Blippar's boss: The real life slumdog multi-millionaire

Ambarish Mitra ran away from home at the age of 15 to live in New Delhi's slums. By the age of 17 he had 55 people working for him. Now, nearly 20 years later, he is the founder and boss of Blippar, a mobile phone app business valued at $1.5bn (£1.2bn). It is perhaps no surprise that Ambarish describes his life as "an adventure". Launched in 2011, Blippar is an augmented reality app. Using your mobile phone's camera, it superimposes animation or graphics onto the world around you. For example, focus on a limited edition can of Coca-Cola - a company which has a tie-up with Blippar - and it becomes an animated jukebox that enables you to play music. Or point the camera at something like a...