"I - Earthman", this is a science fiction, but as close as possible to realities, the descriptions of future, possible events that can lead to the catastrophe and the destruction of the planet Earth. The main character of this work, a researcher, he is the Russian cosmonaut, rescued by aliens, after a long stay on an alien to aliens, on their intergalactic ship returns to Earth, meets the girl, ancestors who survived a nuclear catastrophe and Primitive image of the earth's life of people. In addition to these events in this work by the author, only purely and strictly from its point of view, the topic of human mind is widely disclosed, about the huge cognitive abilities of the human brain, the themes about the dangers emanating from black holes, and the lives of others, reasonable and unreasonable, living creatures in distant land, planets of the universe.