These are the stories of four under-valued women who achieved extraordinary things. Colette wrote a series of successful novels, but her husband published them under his own name. Beautiful film star Hedy Lamarr invented a secret communication system, later adopted by the US Navy. But originally, her invention had been rejected and she was told to ‘stick to entertaining’. Ángela Ruiz Robles invented a mechanical precursor to the digital tablet – 100 years ahead of her time – but wasn’t taken seriously. Seventeenth-century artist Artemisia Gentileschi fought the prejudice of the male-controlled art world to achieve greatness.