Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great beginnings of science fiction genre!

I owned this book a while back, maybe 15 years ago, and forgot just how extensively it covers the science fiction field, both in literature and in movies. The encyclopedia goes back to the 1800's (Mary Shelly, Jules Vernes and H. G. Wells) and traces so many of the science fiction topics it's mind-boggling. Did I mention the hundreds upon hundreds of illustrations? Writers, posters, illustrations from book, this book has them all. That's why it's so heavy! If you're a big science fiction fan who is hooked on asking the "what if" questions, you'll love this book!