15:32DiscoveryImages That Changed The WorldEpisode 1: X-ray and The Double HelixBBC World Service Duration: 27 minutes Wed 26th May 2010, 15:32 on BBC World Service OnlineAvailable for over a yearListen nowDr Mark Lythgoe looks at medical imaging, exploring the impact of X-Rays, foetal ultrasound, brain scanning, and microscopes.GenresFactualScience & NatureFormatsDocumentariesBrandDiscoverySeriesDiscovery: Images That Changed The World Source: BBC Online