Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Don't waste your money

Here's another classic example of a reason so many people dislike science. How can we expect people to put up with the bad language and lack of motivation and application? Textbooks ought to set an example of good writing. The authors do not pay attention to the reader. They just bundle a few points together and call it a book. There's no desire to rise above the median.