instruction:
Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.
question:
I just returned from a month-long trip to Vietnam and Cambodia, and I found this book extremely useful for Cambodia. Not so much for hotel listings, etc., but for no-nonsense background information on Angkor, Phnomh Penh, and Siem Reap. The Vietnam portion was helpful as well, but I relied more on the Lonely Planet and Rough Guide Vietnam editions for that country. I would definitely recommend this book to someone traveling to Cambodia over the Lonely Planet edition, which is *really* outdated.
answer:
Positive


question:
I received the message that the U. S. government is hiding knowledge about what is beyond Earth's atmosphere. But all governments hide information from the masses of their people. What intrigued me was when the Sentinel Prime character said to the Optimus Prime character that they used to be gods and now they were called machines. I can relate to that statement. I am a descendant of a people that were performing high sciences at one point in time and now we are beasts of burden. Try to talk to a typical African person about science and see what you get. At best they'll say, how does this help me pay my bills? At worse they'll look at you like you have 2 heads.
answer:
Positive


question:
I have four of the outdoor units that are as good as a paperweight. At over $200 a piece, I've wasted over $800 on these. Don't waste your money. I've never wrote a review on any product before, and I've bought a lot of things off of Amazon, but these are the worse items that I've ever bought. Avoid at all cost.
answer:

Negative