'Himalayan Viagra' taking its toll

Ram Bahadur Jafra and his two brothers crouch on a field, picking through blades of grass and staring at the soil. They have traveled five days by foot to a Himalayan meadow at a 4,300 meter elevation deep inside Nepal's Dolpa district. They came, as tens of thousands do each year, to harvest a highly valuable commodity from the high-altitude soil: the Himalayan caterpillar fungus -- also known as Himalayan Viagra.

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