A book explaining easy-to-implement principles for improving memory. - Title: How to Prevent Forgetting by 90% - Author: Kimihiro Yoneyama - Series: LIFE - ISBN: 978-4-8379-7466-6 - Contents: 5 Principles for "Good for the Brain" That Are Easy to Do Thank you for viewing. The condition is good, as it has only been read once. This is a book I read when I started to feel my memory decline in my 40s.