Berlin. „Ever since I first met Prof. Yunus ten years ago, I am fascinated by his vision, passion and perseverance", says Kerstin Humberg, founder of Yunel, a Berlin-based start-up with the mission to make happiness work for positive social change. In her view, Yunus is a living example of "human potential at its best". Last week, it was time for her to pass on the YY virus and inspire Berlin-based investors and entrepreneurs as well. Together with Gamal Moukabary, CEO of bon