Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Take Heed

Dr. Jacobs' thesis is extraordinary and chilling. According to "The Threat", aliens and their hybrid offspring are in the final stage of a genetic infiltration of humanity and will take over Earth after a soon-to-occur catastrophic event. And most horrifyingly, there appears to be nothing whatever we can to to prevent it. I've never seen a UFO and have generally regarded abduction reports as inherently incredible, but Dr. Jacobs has presented a well-researched and well-written book that must be read - and heeded. Although Dr. Jacobs knows that his theory will not be taken seriously and therefore believes it is too late to reverse The Threat, I cannot concur. If enough people do take heed, there may still be time to halt the apparently inveitable.