I’ve visited a lot of schools as the f ounder of Girls Who Code. When we launched our afterschool clubs program in 2015, I went on tour, visiting our programs from the wealthiest zip codes in the country to the poorest pockets of America. Many of the students I met —a disproportionate number of them Black and brown—hailed from economically disadvantaged backgrounds; they had tattered textbooks, spotty wifi and—critically for a coding club—sparse, ancient computers. It was my fear that these students would be left behind that led me to create a Girls Who Code book series: a collection of...