Tashi, left, and Nungshi Malik during the 100% Women Peak Challenge, for which 700 female mountaineers from 20 countries scaled all 48 of Switzerland’s 4,000-metre peaks in March. Photo: Tashi and Nungshi Malik
Tashi, left, and Nungshi Malik during the 100% Women Peak Challenge, for which 700 female mountaineers from 20 countries scaled all 48 of Switzerland’s 4,000-metre peaks in March. Photo: Tashi and NunShow more

'Everest Twins' of India: the sisters who conquer the world's highest peaks together