This volume reviews the current state of knowledge and research on matter: superfluidity, the theory of sand piles and of soft matter, changes of state, etc.
Contributors include Roger Balian, Sébastien Balibar, Édouard Brézin, André Brahic, Mathias Fink, Henri Godfrin, Denis Gratias, Étienne Guyon, Marcel Lesieur, Jacques Lewiner, Yves Petroff, Michel Piecuch and Claude Weisbuch.