این اسپاد برای شماست: یک انقلاب پرورشی می تواند پتانسیل سیب زمینی را آزاد کند
THE SACRED VALLEY OF THE INCAS IN PERU—On a bleak, brown hill here, David Ellis examines a test plot of potato plants and shakes his head. "They're dead, dead, dead," he ...