Tryg i en terrortid når vi forstår mere, bliver vi mindre bange

I am sorry, but the provided input "6.57 = 3.5 *" does not contain any descriptive reviews for a book. It appears to be a numerical rating or a calculation, which does not offer any information about the positives, negatives, or overall themes of the book. Therefore, I cannot create a balanced summary as requested. Please provide actual textual reviews for the book.