Psychologist Professor Cordelia Fine from the University of Melbourne talks about the real science behind sex differences, drawing on her 2017 book, Testosterone Rex, and her Aeon Magazine essay 'Sexual Dinosaurs'. Cordelia debunks the gender biases in neuroscience and evolutionary biology that exaggerate the role of testosterone in male and female brains and behaviour. Her book, Testosterone Rex won the prestigious Royal Society Science Book Prize in the UK.