9781599204642 | Smart Apple Media, January 1, 2012, cover price $31.35 | About this edition: In How Toys Float, discover how pushing and pulling forces make floating toys work.

9781599204635 | Smart Apple Media, January 1, 2012, cover price $31.35 | About this edition: Explains how different pushing and pulling forces help bouncing toys work, and the effect they have on the toy's movements such as a change in direction or speed.

9781599204666 | Reprint edition (Smart Apple Media, January 1, 2012), cover price $31.35 | About this edition: In How Toys Slide, discover how pushing and pulling forces make sliding toys work.

9781599204680 | Smart Apple Media, January 1, 2012, cover price $31.35 | About this edition: Explains how pushing and pulling forces help wheeled toys move, and the effect they have on the toy's movements such as a change in direction or speed.

9781599204673 | Smart Apple Media, January 1, 2012, cover price $31.35 | About this edition: Explains how pushing and pulling forces help spinning toys work, and the effect they have on the toy's movements such as a change in direction or speed.

9781599204659 | Smart Apple Media, January 1, 2012, cover price $31.35 | About this edition: Explains how pushing and pulling forces help flying toys work, and the effect they have on the toy's movement.

9781608705719 | Benchmark Books, September 1, 2011, cover price $171.00

9781608705757 | Reprint edition (Benchmark Books, September 1, 2011), cover price $28.50 | About this edition: This series educates readers about the environment and the importance of adopting an eco-friendly lifestyle.

9781608705740 | Benchmark Books, September 1, 2011, cover price $28.50

9781608705764 | Benchmark Books, September 1, 2011, cover price $28.50 | About this edition: This series educates readers about the environment and the importance of adopting an eco-friendly lifestyle.

9781608705733 | Benchmark Books, September 1, 2011, cover price $28.50 | About this edition: Discusses how energy use impacts the environment and what readers can do to make more sustainable choices about their use of energy.

9781608705726 | Reprint edition (Benchmark Books, September 1, 2011), cover price $28.50 | About this edition: This series educates readers about the environment and the importance of adopting an eco-friendly lifestyle.

9781608705771 | Benchmark Books, September 1, 2011, cover price $28.50 | About this edition: This series educates readers about the environment and the importance of adopting an eco-friendly lifestyle.

9780756638221 | Workbook edition (Dk Pub, June 1, 2008), cover price $9.99 | About this edition: Perfect for getting ahead at school or just stimulating children's interest, this groundbreaking series of workbooks leaves the competition in the dust, with exciting subjects, 48 full-color pages, a turn-and-learn info wheel, and special carrying folders.