Hello. I am Teacher Gaia, and I would like to play with you, making nature your companion. Science is not about studying; it is about feeling nature, being curious about it, and thinking about those questions for yourself. The more you have these experiences, the easier and more approachable science becomes. For example, how about these questions? "How much higher can mountains get?" "How much deeper can the ocean get?" Have you ever visited mountains or the sea and asked yourself these questions? The foundation of science is observation, not theory. If you start with observation and solve questions one by one, the foundation of your scientific knowledge becomes solid, allowing you to solve anything. We often hear stories about many great scientists doing eccentric things in nature during their childhood. Since play and thoughts during childhood have a significant impact on intellectual growth, why not try playing with nature? I would like to study the Earth and its surrounding environment with you. From water and air to rocks and life itself, I want us to observe, be curious about, and solve those questions together. It is said that to truly play with the Earth, you need the basics of physics, chemistry, biology, and earth science, but there is no need to worry. You will naturally come to understand just by playing. Let's play together. I studied science education at Seoul National University and geology at the University of Tokyo in Japan. I taught students at universities for a long time. In my spare time, I mentored students at science high schools; I won top prizes multiple times at the National R&E Competition and even participated in the ISEF held in the United States. Having served as a revision committee member for the science sector during the reform of Korea's national education curriculum, I understand the connections and flow of the curriculum from elementary to middle and high school better than anyone. I also served as a review committee member for elementary and middle school science textbooks (including digital textbooks). Furthermore, I served as a question setter for the College Scholastic Ability Test (CSAT). Meanwhile, I have authored several science books for elementary and middle school students, some of which were selected as excellent science books and others as Sejong Books. I always hope that students can study science easily. To achieve this, they need to develop the ability to solve nature's problems on their own through diverse experiences, but I am concerned that students these days lack the time for that. Instead, I would like to explore various environments and situations with you, even if only indirectly. I have traveled quite a bit. I have been to the South Pole, the North Pole, and even Africa. I hope to have fun playing with the Earth while sharing my experiences with you.