Irène Joliot-Curie found that radioactivity wasn't just something to be found in the earth's elements -- scientists could make other metals radioactive. And then her research took her right up to nuclear fission...and World War II.

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Music in this episode: Thematic by Blue Dot Sessions Divider by Chris Zabriskie John Stockton Slow Drag by Chris Zabriskie Frog Legs Rag by James Scott from 1906 piano roll Keep The Prices Down by Podington Bear Morning Mist by Podington Bear The Zeppelin by Blue Dot Sessions Beachhead by Podington Bear Grand Fell by Blue Dot Sessions Because You Hold Me Tight by Alex Fitch