 I'm in the desert oasis of Khorizm in Uzbekistan. For seven years, the oasis was my home. Each rural roadside around here is flanked by pollarded white mulberry trees, grown for their leaves, not their fruit. Men and women are busy hacking down branches and loading up a donkey with them. The best thing about growing worms is that it's not for too long, Bibi Khan explains. When the worms are a week old, they're weighed out and however many grams we get of worms,