At an altitude of 5000 meters in the Himalayas is found Yarsagumba, a caterpillar-fungus that is worth more than its weight in gold. Thousands of Nepalese villagers trek up the mountains every spring, braving difficult temperatures and terrain, in search of this hard-to-find but invaluable commodity. Its trade in Hong Kong and China, where it is considered a medicinal mushroom and elixir of youth, amounts to billions of Euros every... see more