Five hundreds years ago a Spanish physiologist declared that genius was stored in the testicles. Even today, studies have shown that people associate men with genius more than women. Award-winning science writer and broadcaster Angela Saini wants to know why. Saini examines why people are so reluctant to credit intellectual brilliance to women - now and throughout history. Einstein, for instance, needed a woman’s help. She hears about a proposal for making the concept of genius more inclusive and discusses the impact on girls in school when teachers take gender out of classrooms.