In the 1970s, scientists began to study chaotic manifestations in the world around us: the formation of clouds, turbulence in sea currents, fluctuations in the number of plant and animal populations... Researchers are looking for links between different pictures of the messy in nature. Ten years later, the notion of "chaos" lent its name to a rapidly expanding discipline that has upended all modern science. A special language arose, new concepts appeared: fractal, bifurcation, attractor... The history of chaos science is not only a story of new theories and unexpected discoveries, but also a story of belated comprehension of forgotten truths.