Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Excellent

This is an excellent book to understand the historic human challenges associated with histroic human polar exploration and what will be confronted by future humans bases on the Moon and Mars. The analogs of the past have much to teach us for the future if we take the time to understand the past experience and relate it to what humanity is now seeking to do with a lunar base in the next two decades. The book is exciting, entertaining, and insightful. For any person thinking about the challenges that will confront humans associated with the first permanent human lunar base, this is a must read.