Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A Delight and Requirement for People in the "Hard" Sciences

I have only given out three books in my lifetime, and this was one of them. Actually, I gave two copies of this book, and probably will give more. There are many books that I praise and/or recommend, but only the best ones are given.The reader must be somewhat open-minded, but what student or practitioner in the "hard" sciences doesn't need to be that way?A definite recommendation.