We all appreciate a quotation because it is wise, rich, beautiful, or funny. This book is a different kind of quotation book. It seeks to achieve two purposes. First, it contains mainly "powerful" quotes. A powerful quote is one that makes great impression when you hear or read it. with most of the other quotation books, you will need to read several pages before you find a "powerful" quote. Second, the quotes are specially designed to benefit scientists and engineers in their various uses of quotes. of course, those who are not scientists or engineers can also benefit from the book. We hope that this collection of quotations will provide inspiration to the readers.