The book tells in a light and relaxed form about very difficult and serious things - about the risks of nanotechnology. Gray slime and combat nanorobots are all that the average consumer knows about the threats associated with nanotechnology. But this is just a drop in the bucket. The gap between the world of "nano" and the world of "macro" is great, so it is very difficult to understand the nature of the threats emanating from this world. But it depends on this understanding how much a person can master nanotechnology, learn how to safely handle nanomaterials, control the spread of nanoproducts, and prevent the use of the results of scientific and technological progress to the detriment of himself and the environment.