"A World Full of Demons" is the latest book by Carl Sagan, an astronomer, astrophysicist and outstanding popularizer of science, published after his death. This book, devoted to one of his favorite topics - the human mind and the fight against pseudo-scientific stupidity - is a kind of result of all his work. Myths about Atlantis and Lemuria, faces on Mars and encounters with aliens, magic and reincarnation, clairvoyance and snowman, creationism and astrology Sagan consistently and ruthlessly exposes myths created by ignorance, fear and self-interest. This book is a skeptic's manifesto, a textbook of common sense and scientific method. Bright, deeply personal text is 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 at least 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 even before it formed All humans are related and descended from the same ancestors who lived several million years ago. Science opens up unprecedented possibilities, and humanity has long had no need to invent idols and allow itself to be manipulated.