Jola Venture with ties between Boston and Cameroon is working on bringing modern innovations to rural and impoverished communities. They haven't scaled like a "Startup," but they operate like one. http://jolaventure.com
My "aha" moment for that one was when I read Terry Pratchett's first Discworld Novel, "The Colour of Magic", I guess when I was about 12 or so. First I laughed my head off at this ridiculous word and then, from the context, I worked out what it meant. A lesson I've never forgotten, as I'm sure this one will be for you...
Check out the Up Series if you find this interesting. Video interviews with English kids from age 7 to 56. "Give me a child until he is seven and I will give you the man"