Email Editor’s Note: This work was supported by the Emergency Fund by COVID-19 for Journalists from the National Geographic Society. Juan Yupanqui stared at a pile of mattresses, still wrapped in the plastic they came in when he bought them nearly a year ago. He wondered out loud if they would ever do more than gather dust. The mattresses were stacked in one of the round, thatched-roof guesthouses Yupanqui built last year on his homestead in Patacancha, a small village nestled more than 11,000 feet above sea level near the colonial city of Cusco, in Peru’s southern Andes. With their small...