Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Eeek kid, look out!

Living on the same island (Kauai)as Michael Crichton, I was very happy to be in the unique position to get an autographed copy of this book. If you hate action, I can't help you--this novel vibrates in your hands. Michael will be the first to tell you that the mechanism of time travel in this instance is a writers device that his more learned physics-related friends might take issue with;but elements of his imaginative look at the possibilities yield tangible aspects. I don't want to overexpose--so I'll just say that the "field buck" phenomenon seems entirely likely. The clock is ticking.