hans rosling, a swedish doctor who died t two years ago, wasa star on the internrnational conferenceircuit. hienenlighteng a and entertainingng ted talks h haven viewed by mimillions onlinine. can never ev endnd eremee rich cocountriethpoverty." "oh,h, w what has happened. think so. we he e to be more s systematc whenen we fight dedevastatg ignorarance. hannnnah: and thenen i discovd the work o of hans rosliling, really realized all of the conceptions i'd had about how the woworld was chananging were really wrongng. i had spent all these years in education,n, i kept up to o de with the daily news, and i just had no idea. reporter: so why does news tend to be dominated by misery and suffering, while positive stories barely have an impact? media critic peter littger says the imbalance in coverage is no accident. peter: negative stories are just part o of the media product meu that we are served. reporter: and that menu, littger says, is determineby intenen cocompetition inin the media w. whetether print, o online, or td radio, the desire to court exaggeration and sensationalism, in the