The documentary \u2018Bombshell\u2019 explores the life and legacy of Hedy Lamarr, a star from Hollywood\u2019s golden age and an inventor whose ideas are still in use in wireless technology. Her inventions weren\u2019t recognized until late in her ultimately tragic life, and never made her any money. \u2018Bombshell\u2019 director Alexandra Dean tells us about Lamarr\u2019s extraordinary career, on-screen and off.