Alika lives on Lagos mainland, a city with twice the population of New York. Her brothers and sisters are fast asleep, but she’s restless. She’s curled on her side, facing the wall, whispering questions softly into her phone. The phone’s AI dutifully responds in her native language, patiently explaining concepts and ideas, telling stories of people she hasn’t met and places she hasn’t seen. She attends regular school and enjoys socializing with the other children during the day, and...