Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Do you want to calculate twice as fast as you do now? I do.

So why don't you buy this book, then? You will not be dissapointed. It covers addition, subtraction, multiplication and division. Completely new algorithms for solving arithmetic problems. Everything you learned in school is wortless compared to those techniques. Of course, you must study them carefully. You will not be a genius after skimming this book on one day, but the one who study it carefully will be on he's way. The only reason it didn't get 5 starts is that there must be one left to "The Hitch Hiker's Guide to the Galaxy" ;)