Instruct: Classify a given review as either positive or negative.
Query: Megalithic Mysteries Demystified

Everything you always wanted to know about Stone Circles but were too afraid to ask...Robin Heath's very readable style explains how neolithic civilisations would have planned, measured, and even built their fantastic astronomic calculators. Find out how the geometry and measuring systems of these people were linked to the Sun and the Moon's rotational periods, and even how to build your own stone circles!