Until a few decades ago, scholars believed that young children know very little, if anything, about what others are thinking. Swiss psychologist Jean Piaget, who is credited with founding the scientific study of children’s thinking, was convinced that preschool children cannot consider what goes on in the minds of others. The interviews and experiments he conducted with kids in the middle of the 20th century suggested that they were trapped in their subjective viewpoints, incapable of imagining what others think, feel or believe.