It's worth learning. It can explore things in the universe, stimulate children's interest and enrich children's knowledge of cosmic culture. "Scientific Exploration of Space Dolphins" is a series of courses independently developed by front-line science educators organized by Cordier Education Group after years of practice. It is specially designed for children aged 6- 15, and is dedicated to creating a thematic basic science exploration course suitable for children in China. The primary school series of this course consists of 10 volumes, including more than 150 interesting scientific experiments, integrating biology, physics, chemistry and interdisciplinary.