On this week’s Tech Nation, part I of a two-part series on Chernobyl: Then and Now. Journalist Adam Higginbotham, author of “Midnight in Chernobyl”, recounts what exactly happened at the time of the accident. Later in the show, Vincent Keunen, the Founder and CEO of Andaman7, describes a new app to collect and manage your own medical records, and Helen Torley of Halozyme returns to talk about a technology which reduces the time for infusion therapy.