Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Very sad.

The parts of this book that deal with history are fairly interesting. Once the author starts detailing his "theories" of Time, Space and Infinity it becomes rather sad. Very much in the manner of those pathetic individuals who spent theirs lives trying to build a perpetual motion machine, prove the world is flat or turn base metal into gold.For anyone interested in mathematics, space and infinity I would recommend:One Two Three . . .Infinity, George GamowNumber Theory and its History, Oystein OreFeynman Lectures on Physics, Richard P. Feynman