Richard Holmes, whose recent books include The Age of Wonder and This Long Pursuit, will explore the various friendships and mentor relationships that Mary Somerville (1780-1872) formed with contemporary scientists John Herschel, Charles Babbage, Ada Lovelace, and Maria Mitchell (USA). These serve to illuminate the whole question of women in science, popularising science, and scientific education, in a period of unprecedented advances in science, exploration and understanding of the universe.