Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Rara avis: an eloquent marine biologist

Trevor Norton is a very gifted man: he is undoubtedly a first-rate scientist, who enjoys his profession inmensely, but he has other virtues as well. First, he can write: every page is elegantly crafted, with a knack for the telling detail and a gift for the essential. In a few pages you are there with him, becoming acquainted with an underwater scene, or with a long-deceased biologist. Second, Norton is interested in everything, from science to history, reminding us how fascinating life itself can be, if only we care to look. And he has a sense of humor.