Blogging from TED conference, Ethan Zuckerman writes, “As a precursor to the sorts of African thinkers we’ll be seeing in Arusha at the TED Global conference, we’re honored to hear from former Nigerian finance minister Ngozi Okonjo-Iweala. She developed a fantastic reputation for change in Nigeria, stepping down as a vice-president of the World Bank to take on the toughest ministry in sub-Saharan Africa’s largest nation.”