infrastructure, some very basic health services, and schools and bringing in teachers, better medical care, mosquito nets. sort of a packet of a dozen, let's say, basic interventions. fertilizer and high-yield seeds and vaccinations for livestock so a packets of low-cost interventions that in his mind, when you did them all at once, had a sort of exponential impact. >> hi. i have to confess, nina munk is my friend and classmate from columbia. but i'll ask a legitimate question. i'm originally from uganda and i was with a ugandanan a short while ago who actually work with jeffrey sachs on some of these programs, and he said the key problem was that he didn't listen a lot. he wanted to, for example, talk to presidents and not secretaries of the ministries who actually knew what was happening on the ground. my question is: how much was it about jeffrey sachs caring about the people and the projects and how much was it about him trying to prove that jeffrey sachs could do this amazing thing, that perhaps would never be duplicated again and be remembered for a long time? because you wondered why with all his