Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

Q: I had almost all of the Jean Auel's books and needed this one to complete my collection. It turned out to be a book club size and I traded it to a friend for the full size version.

A: Positive
****
Q: The book covers several generations, so with each generation you have to re-learn all the characters. It is difficult to keep track of who's who when every time you get to know the cast, 200 years suddenly pass and we're in the middle of a new crisis. I didn't read the whole series because of this -- it was obnoxious.

A: Negative
****
Q: I bought this plug as a substitute to replace the Apple one that blew out. Unfortunately, this plug seems to have problems. I noticed that it heats up really badly when plugged into some plug outlets and causes my laptop to heat up as well. Once, I also heard some noise coming from my iBook G4 that wasn't there before. This noise went away when I unplugged the power cord. What I'm most upset about though is that it seems to have shortened the battery life of my computer to about 50% now! I think I should have bought the Apple plug instead.

A:
Negative
****