03:5050 Things That Made the Modern EconomyRadarBBC World Service Duration: 9 minutes Sat 26th Aug 2017, 03:50 on BBC World Service East and Southern AfricaAvailable for over a yearListen nowHow the high-tech ‘death ray’ led to the invention of radar. Show more GenresNewsFormatsDiscussion & TalkBrand50 Things That Made the Modern Economy Source: BBC Online