Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Provocative look at modern science and ethics

Gray Matter was a fantastic read, weaving together ethics, medicine, scientific discovery and learning disabilities in an engaging and page-turning manner. Braver kept me on the edge on my seat in a roller-coaster like ride of emotions. The characters are real, honest and believable in their struggles raising a learning-disabled child. This book forces you to hink, it is much deeper than most other thriller/sci-fi novels. There is a moral strain in this story that tugged at my own feelings towards such scientific progress. Gray Matter is a compelling commentary on the progress of modern medicine and genetic engineering.