Born in war-torn Afghanistan, Waheed Arian's first memories are of bombs. His first-hand experience of the power of medicine inspired him to dedicate his life to healing others. But how does a boy with nothing hope to become a doctor?

Fleeing the conflict with his family, he spent much of his childhood in refugee camps in Pakistan, living sometimes ten to a room without basic sanitation or access to education. Waheed largely taught himself, from textbooks bought from street-sellers, and learned English from the BBC World Service.

Smuggled to the UK at fifteen with just a hundred dollars in his pocket, he found a job in a shop. He was advised to set his sights on becoming a taxi driver. But the boy from Kabul had bigger ambitions.

Working through PTSD and anxiety, he studied all hours to achieve his vocation. He was accepted to read medicine at Cambridge University, Imperial College and Harvard, and went on to become a doctor in the NHS, currently in A&E.

But he wanted to do more. In 2015 he founded Arian Teleheal, a pioneering global charity that connects doctors in war zones and low-resource countries with their counterparts in the US, UK, Europe and Australia. Together, learning from each other, they save and change lives - the lives of millions of people just like Waheed.