When I was 15, I flew to Nepal. Hiking through the Himalayas, while teaching school children English and helping out at an orphanage? Could I have been a more selfless teenager? I was off to save the world. There are few things more cringeworthy than watching 20 British schoolgirls trying to build a well under the scalding Nepalese heat. This is what I imagine a group of local men were thinking as they politely stood back while we puzzled our way through this contraption.