18:32DiscoveryScience Stories: Series 4Humphry DavyBBC World Service Duration: 27 minutes Tue 16th Jan 2018, 18:32 on BBC World Service East and Southern AfricaAvailable for over a yearListen nowThe story of how Humphry Davy discovered laughing gas in 1799 Show more GenresFactualScience & NatureFormatsMagazines & ReviewsBrandDiscoverySeriesDiscovery: Science Stories: Series 4 Source: BBC Online