A man from the Korowai tribe chops down a sago palm, deep in the West Papua wilderness.
A few years ago I joined an expedition into the heart of the West Papuan jungle, to meet the elusive Korowai tribe.
At the main jungle camp we saw the tribe processing sago, the staple diet of the Korowai.
The process is long and complex, and the whole tribe gets involved to make enough food to last for weeks.
As I watched the Korowai at work, I was gripped by a mystery illness. I eventually collapsed in the mud.
As I was days from the nearest hospital, it was one of the scariest experiences of my life.
