A fun and educational 4-book set with a cumulative total of 3 million copies sold! This series explains a wide range of "why?" and "how?" questions, from everyday mysteries to the mysteries of the Earth and the universe, with rich illustrations and text. A popular series that is also interesting for adults to read. - The Mysteries of School: Why? How? - The Mysteries of the Body: Why? How? - Fun! The Mysteries of Science: Why? How? For 3rd Graders - Fun! The Mysteries of Math: Why? How? For 1st and 2nd Graders - The Mysteries of School: Why? How? Addresses questions about school and studying that are difficult to answer, such as "Why do I have to go to school?" and "Do I have to study?" Price: 1100 yen (tax included) Author: Akihiro Numata (Supervisor) Number of pages: 192 Size: A5 - The Mysteries of the Body: Why? How? A chance to think about how the body works! "How does the body move?" "Why do I get out of breath when I run hard?" "Why do I cry when I'm happy?" Price: 1210 yen (tax included) Author: Takeo Sakai (Supervisor) Number of pages: 192 Size: A5 - Fun! The Mysteries of Science: Why? How? For 3rd Graders A "reading encyclopedia" that satisfies intellectual curiosity. The reasons and mechanisms of "why?" are all explained with pictures! Price: 935 yen (tax included) Author: Tetsuya Murayama (Supervisor) Number of pages: 192 Size: A5 - Fun! The Mysteries of Math: Why? How? For 1st and 2nd Graders The world is made of math! Familiar mysteries related to math are explained with pictures. Introduces the unexpected math found in everyday life. Price: 935 yen (tax included) Author: Yoshikazu Yamamoto (Supervisor) Number of pages: 192 Size: A5 Condition: Almost unused, so it's in near-new condition, but there are some stains and scratches. There is a slight stain on the top of the "Mysteries of the Body" book. There are some scratches on the spine. Please check the condition in the photos. We will carefully pack and ship the items.