Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Needs to be authored by an expert.

I was dissapointed by the author's obvious lack of expertise on the subject which was demonstrated in many areas of the book. For example he states that "nobody really knows what causes St Elmo's fire", yet most high school science students know exactly what causes it. He also discusses ball lightning as if it were real, when it's never been proven to exist. Rather than trying to be easy to understand, the author opted for cutesy phrases as if he were talking to a four year old, to the point that it is difficult to understand even the table of contents. All in all, it was a letdown.