Screen siren, women’s rights champion and inventor, actress Hedy Lamarr had one hell of a cv. The screen stuff you probably know about because Lamarr was about as big a star as they come, swinging from melodrama to screwball comedies while still retaining her famous ‘beautiful woman alive’ crown. But she was so much more than that. She threw herself into the war effort and tirelessly championed fair pay for women but it’s her role in developing frequency hopping that is the least well known. Frequency hopping went on to be the basis of both wifi and bluetooth so it’s possible that without the star of The Female Animal and The Heavenly Body we wouldn’t be reading this now. Alexandra Dean’s film uses Lamarr’s diaries and letters, with a wealth of period clips to make up a study of a truly remarkable woman.