A novel that makes the double biography of Gauss, the mathematician, "engineering model", and Alexander von Humboldt, and original scientific tireless adventurer. Racondé by a succession of amusing anecdotes, these two portraits are brushed at a hectic pace, going back to childhood. We follow their parallel and separate paths that eventually intersect. Two contrasting characters. It's never serious, often ironic, and our two historical phenomena take touchingly realistic color. By the way, we meet Kant and Goethe too surprising.