I was ready to head home after giving a lecture about Inferior—my book documenting the history of sexism in science and its repercussions today—when a soft-spoken woman approached me. She told me she was studying for a Ph.D. in computer science at a British university and was the only woman in her group. Her supervisor wouldn’t stop making sexist jokes. He never picked her for workshops or conferences.

“Every interaction is awkward for me. I feel intimidated,” she said. “Most of the time I just find myself counting every minute.” Her plan was to see out the final years of her Ph.D., leave the university, and never look back.

I’ve had hundreds of these fleeting encounters with women scientists