Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Fascinating book on an astonishing variety of topics.

Charming, with chapters such as "The Significance of 'Nothing'" and "The Mystery of Free Will" and "Wilhelm Reich and the Orgone." On philosophical topics, the book is accessible and fascinating. On science on math, it is mind-bending. On historical personalities, Gardner either takes no prisoners and is hilarious, or is admiring and gracious. Puts new spins a lot of ideas you take for granted (such as the meaning of 2 + 2 = 4), and introduces a whole bunch of things you never thought about. Really neat.