During the 2016 Copernicus Festival Gregory Chaitin delivered a lecture entitled “Beauty in physics, mathematics and biology,” in which he tried to show what is the beauty in natural sciences. “The theory is beautiful when it easily explains complicated things” – he said. Gregory John Chaitin is an Argentine-American mathematician and computer scientist. Beginning in the late 1960s, Chaitin made contributions to algorithmic information theory and metamathematics, in particular a computer-theoretic result equivalent to Gödel’s incompleteness theorem. He is considered to be one of the founders of what is today known as Kolmogorov (or Kolmogorov-Chaitin) complexity together with Andrei Kolmogorov and Ray Solomonoff. Today, algorithmic information theory is a common subject in any computer science curriculum.