[UNIT 01] Dinosaurs [UNIT 02] Science [UNIT 03] Science and Problems [UNIT 04] Leonardo da Vinci and Galileo [UNIT 05] Isaac Newton and Thomas Edison [UNIT 06] Inventions [UNIT 07] South America [UNIT 08] Antarctica [UNIT 09] Australia [UNIT 10] America’s Past [UNIT 11] The Pilgrims [UNIT 12] Slavery [UNIT 13] The Boy Who Cried Wolf [UNIT 14] The Maid and the Milk Pail [UNIT 15] Melody and Rhythm [UNIT 16] Enjoying Music [UNIT 17] Tahitian Landscape [UNIT 18] Blue Atmosphere [UNIT 19] Subtraction [UNIT 20] Differences