Gakken Manga New Secrets Series "The Secrets to Sharpening Your Mind" Perfect for curious elementary school students. This book introduces the structure and function of the brain, explaining how to memorize things and how to think through problems. Most pages contain trivia related to the head and brain. Originally priced at: 880 yen. The book has only been read once by a child and is still in good condition, so it is being offered to those who understand that it is a used item.