Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Exhilirating,real,apocalyptic tune,very real and possible

As a reader and absorber of scientic writtings,both science-fiction and real,this book is a great reading.And surprisingly,this is my first reading of shefield.very great science author.The apocalyptic tune of the book is real.Very inflaming,possible and a story that reminds us all that the technological gadgets around us may not be able to help[ us all someday,and both nature and our actions can render them useless ,and could fail us all.The book is a great apocalyptic masterpiece,and i enjoyed it.the book is also a serious reminder of how our last days could look,the end of time.A serious survivalism book,the events that will eventually put us all on the survival mode is the fear of all establishments and mankind,and we are doing all we can to avoid it,b=ut it can happen,it does happen everyday thru a lot of accidents that we all see.I think the book is great.A thumbs up