Nono and Lily, who love inventions, participated in a space-time learning journey. They returned from the future to a refugee camp in Africa 60 years ago. There were no high-tech products in the camp, but they discovered it A glue bucket that turns sewage into drinking water, a toilet that generates electricity, There are also a bunch of poop-eating earthworms! What kind of amazing inventions are these? What can these inventions be used for? About the author/illustrator Jiang Zhijie, nicknamed Mr. K, is a Hong Kong cartoonist whose representative works include "Samba AMIGO". He won the Golden Dragon Award for "Best Children's Comic" in the 4th Golden Dragon Award Original Animation and Comic Art Competition. Recommended by all walks of life "Parents are worried about their children being addicted to computers and mobile phones, but they understand the importance of STEM and technology in the future. How to strike a balance between these two points? "The Best Invention" lets children know that people in the world have different needs, and inventions are to improve life. This is also the starting point for learning STEM.” Principal Zhu Ziying, Chief Principal of Decui Primary School "Human beings' imagination of technology is eternal. When I was a child, I watched "Ding Dong" and imagined that future technology could help children solve problems, regain confidence, and bring laughter. Poverty-stricken areas need to combine creativity and practice to solve basic life problems. "The Best "Invention" allows children to face the current situation of poverty, stimulate their imagination and enthusiasm for the future, cultivate empathy and desire to help others, and encourage them to shine." Tong Zhaosheng‧Senior Lecturer, Department of Physics, The Chinese University of Hong Kong "STEM allows children to use scientific knowledge to design innovative solutions to solve life problems: through the stories in the book, children expand their international horizons, encourage the good use of science to relieve people in developing countries, and think about the importance of international rescue."