♪ >> shining solution: with energy generated from farm waste, one ugandan is bringing light to villages. ♪ >> fearsome neighbour: to many on taiwan's matsu islands, china china feels perilously close. >> i introduced myself and said, "hi, i'm cristian. i'm from siloé," and everyone in the room said "oooh." [laughter] it's really danagerous there! >> how do you ditch a bad reputation? residents of one colombian slum have an idea!