Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.
Example: I've read this book with much expectation, it was very boring all through out the book
Example solution: Negative
Example explanation: Review writer does not like the book because it was boring, therefore it is a negative review.

Problem: This is probably the best reference about Heinlein's works that's ever been written. One of the best thing about it is that it's complete and very well organized, so that you can find whatever you're looking for in a few seconds, very handy.Since I've bought it I've consulted it hundreds of times, I couldn't do without it.
Solution: Positive