I think it's probably this one: http://www.ted.com/index.php/talks/william_kamkwamba_on_building_a_windmill.html http://www.ted.com/index.php/talks/william_kamk

I think it's probably this one: http://www.ted.com/index.php/talks/william_kamkwamba_on_building_a_windmill.html http://www.ted.com/index.php/talks/william_kamkwamba_on_buil... "When he was just 14 years old, Malawian inventor William Kamkwamba built his family an electricity-generating windmill from spare parts, working from rough plans he found in a library book." Though the actual interview is a bit awkward at times, I found his story to be very inspiring.