Beautiful video about flying kites in the crowded favelas of Rio de Janeiro. Kids coat the kite strings with powered glass and duel with the other kites. Saw the same sort of competitive kite flying in Pontianak, West Kalimantan when I lived there in the 1990's. You'd pick up a wad of string on the street to throw it away and cut your fingers. Ouch. [NOTE: Filmmaker Guilherme Tensol produced the documentary for the New York Times].