publication of books and social studies, language arts, history, geography, science, mathematics, measurement, literature, writing, spelling, reading, music, art, drawing, paper folding, business, economics, health education, sex education, self-esteem, physical education, computer education, current events, civics, citizenship, political science, foreign language, sports, ethics, philosophy, religion, critical and creative thinking skills, logic, simulations, visual thinking, bi-lingual, Eng...