The Happy Science series adopt the inquiry-based learning pedagogy to develop Science literacy in young children. To support this pedagogy, the series use the instructional framework, Engage-Explore-Reflect cycle (Chalufour et. al. 2004) to design our teaching and learning content. In the Happy Science series, we use thought-provoking questions and relevant real-life scenarios to arouse pupil’s interest in learning Science. There are interesting investigative or hands-on activities to develop the pupils’ inquiry and process skills in Science. Teaching notes are included as a guide for teachers to help pupils achieve their learning outcomes. There are also fun activities throughout the book to keep pupils engaged.