"Head-Friendly Trivia Book" contains interesting trivia from various fields such as daily life, culture, science, and history. Author: Hitoshi Takeuchi (Emeritus Professor, University of Tokyo) This book has been stored on my home bookshelf for a long time. There is a slight stain on the top edge of the book, but the pages are clean with no stains or sun damage. Please consider this item with the understanding that it is a used book.