Instruct: Classify Amazon reviews into positive or negative sentiment
Query: clear as crystal

This book is the most clearly written book I have ever read. Liddle has a knack for making difficult concepts easy to comprehend through his use of analogies and vividly accurate descriptions. The cosmological ideas are explained at an intuitive level and have been imprinted on my mind forever. This book is a great introduction for the less mathematically minded though also a great source of information for others. This book book covers a great amount of cosmology the big bang, nucloesynthesis, inflation, cosmological models etc and is set out in a very logical order. I would thoroughly recommend this as an introduction although for those interested in more mathematical rigour other text books may be necessary.Well done Dr. Liddle ! A great achievement .............