Instruct: Classify Amazon reviews into positive or negative sentiment
Query: The Difference One Letter Can Make

This book's title, which elicited the publisher's mistaken cover image, has to be one of the most unfortunate screw-ups in publishing history. The "P" in the final word of the title was of course intended to be a "T." The book addresses a public health scourge that kills millions worldwide every year: diarrhea.