Industrial farming has discarded genetic diversity in favour of a handful of high-yielding monocultures. But these exhaust the soil and are vulnerable to crop diseases and pests that genetic diversity protects against. Now some agribusinesses and farmers are seeing sustainable profits and productivity in encouraging crop diversity. Nature Inc. focuses on the humble potato in its home in the High Andes and in Africa and Asia to see how going back to long forgotten varieties can improve food security and on farm profits. As one scientist enthuses: 'it is one sexy tuber.'