Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Scientific Men-in-Black.

Fans of Frank Drake's "Is Anyone Out There" rejoice, Greer should receive honorary status as a member of "The Order of the Dolphin." This book offers fascinating speculation on the matter of life existing elsewhere in the universe. Read the book to learn more about the history of mankind's search for extraterrestrials, why it is likely that life exists elsewhere, and the impact of what such a discovery means to our own planet and our existence. Further, Greer believes that alien life has lived (or is currently) living among us and he sets out to assert this with substantiated cases. If you ever watched earth: final conflict and believed things could sort of play out like this... the book is for you.