Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Polio, An American Story

An amazing book. Unbelievably informative -- but, at the same time, reader-friendly (Thank goodness). I couldn't put the book down. The story behind the politics behind the race for a cure....and, the ramifications, effecting us to this day, with regard to some of that very saga is truly incredible. Brilliant book.