In a world ruled by technology and scientific progress, it seems there should be no place for ignorance, speculation and unproven hypotheses. But contrary to common sense, for some reason many, on the contrary, fiercely defend conspiracy theories and believe the most implausible statements: for example, that the Earth is flat, climate change is a fiction, and the coronavirus is a biological weapon. Philosopher of science and teacher Lee McIntyre met dozens of dissidents and compiled a fascinating guide to this irrational community. He managed to figure out how it works, understand how to talk to its adherents and what arguments work for them. He is sure that science deniers need to be convinced, because their delusions are sometimes deadly. The publishing layout of the book is saved in PDF A4 format.