Rich in calcium, iron and protein, gluten-free teff offers Ethiopia the promise of new and lucrative markets in the west. Claire Provost and Elissa Jobson investigate
Emma Bryce: When Mick Ebeling read about a boy in South Sudan who had lost his arms, he set off with a 3D printer to make him a prosthetic limb. Now the project is bringing hope to the country's other 50,000-plus amputees