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Abstract: Entropy was introduced in 1865 by R. Clausius, inspired by the work of S. Carnot, to formalize the Second Principle of Thermodynamics. Many macroscopic phenomena, in physics, chemistry, and biology, are explained by the couple formed by energy and entropy, "the mistress of the world and its shadow". During this presentation, we will revisit the concept of entropy in light of recent developments in the study of out-of-equilibrium systems and information. ---------------------------------- You can join us on social networks to follow our news. Facebook: / instituthenripoincare Twitter: / inhenripoincare Instagram: / ihp_maisondesmaths