“A Demonful World” is the last book by Carl Sagan, an astronomer, astrophysicist and outstanding popularizer of science, published after his death. This book, dedicated to one of his favorite topics - the human mind and the fight against pseudoscientific stupidity - is a kind of summation of all his work. Myths about Atlantis and Lemuria, faces on Mars and encounters with aliens, magic and reincarnation, clairvoyance and Bigfoot, creationism and astrology - Sagan consistently and mercilessly exposes the myths created by ignorance, fear and self-interest. This book is a skeptic's manifesto, a textbook of common sense and the scientific method. A bright, deeply personal text - not only a battle with pseudoscience, but also an amazing picture of the formation of a scientific worldview, the greatest discoveries and ascetics. Science for Sagan is pure joy, it is amazing in itself. Take just a few facts: all information about a person is contained in every cell of the body; quasars are so far away that their light began to radiate towards the Earth before it was formed; all people are relatives and descend from the same ancestors who lived several million years ago. Science is opening up unprecedented possibilities, and humanity has long since ceased to need to invent idols for itself and allow itself to be manipulated.