Instruct: Classify a review into positive or negative sentiment.
Query: 3 generations of the Andersons agreed this is GREAT!

I first read this book at about age 35. Then lent it to my 66-year-old father. Just as was I unable, so, too, was he unable to put it down for more than a meditative moment to complicate Asimov's musings.After Dad read it I loaned it to my older son, then aged 12. He had the same addiction as Dad and I.The three of us are not prone to dwell on science, history, or anything of great consequence often, but we still frequently discuss topics first brought to our attention by probably the greatest, and certainly one of the most prolific and diverse writers in history.I challenge any reader to not contemplate many of the thoughts expressed by Asimov in this fascinating and intriguing book.Asimov and Hawking were probably the two most intelligent science writers of the 20th Century. Asimov alone, however, also was a skilled writer of history and fiction.