Peasant Egberto Mamani works with potatoes that will be used to elaborate chuno (dehydrated potato) in Machacamarca, Bolivia, on June 30, 2021. - From the Aymara word "ch'unu", this ancestral method of uncertain origin, also used in Peru, allows potatoes to be stored for decades without losing their nutritional properties: carbohydrates, fibre, vitamins and minerals. (Photo by AIZAR RALDES / AFP)