Instruct: Classify Amazon reviews into positive or negative sentiment
Query: engaging combination of essay and biography

Other reviewers have singled out comparatively minor mistakes in Watson's book, and some have complained about the way he injects himself into Descartes's story. But I like the way Watson makes it personal, recounting stories from his travels and laying out his own philosophical attitudes in some punchy prose. I suppose if someone wants a cold retelling of the facts of Descartes's life, another book would be better. But as a long personal essay that aims to explain why the author finds his subject so interesting, I think it's very well done, and a good read.