From the Zambian outback to a remote village in Bulgaria and the industrial north-German city of Bremen: three young teachers who are determined to educate - however many challenges come their way.

Poverty, parental illiteracy and long distances mean almost a third of girls in rural Zambia have no access to education. Innocent Banda, a 29-year-old volunteer teacher, is fighting to change that.

Bulgaria is in dire need of good teachers, but it pays them less than any other EU nation. 23-year-old Aleksandar is one of the few stepping into the breach.

Marlou is a trainee teacher from the 'wrong' side of the tracks. She wants to inspire disadvantaged children that they can become something too. But the rigid rules of Germany’s education system are getting in the way.

Antonia thought being thin would make her happy, but instead she slipped into a spiral of despair and landed in hospital. Now she’s through the ordeal and is a role model to thousands worldwide.

Isis is caught up in Brazil's craze for plastic surgery. She is just 23 and has already undergone liposuction and breast-enlargement procedures. “I just want to feel better about myself,” says the naturally beautiful Brazilian.

Thomas plans his life around working out and has muscles many men would die for. But when the young bodybuilder looks in the mirror, he doesn’t see the perfect physique others do. What if he never achieves the perfection he desires?

Tsegi can’t breathe like other people. The young Mongolian has severe lung problems - that are man-made: she’s from Ulan Bator, one of the world’s most polluted cities.

20 year-old Alexander really needs a new heart - the one he was born with doesn't drain blood properly. But Germany's organ donation system is in crisis, and he doesn't know how long he'll have to wait.

David fought for his Queen and country in Iraq and Afghanistan. But when he returned home, his nation failed him. This is the story of post traumatic stress disorder, the invisible battle scar.