Konwersatorium im. Leopolda Infelda

The unification of electromagnetic, weak and strong forces is an old, XX century dream and still an ongoing program of particle physics. The new experimental machine, the Large Hadron Collider at CERN (Geneva), should provide data necessary to build a new step toward this goal. I shall discuss the unification in the modern context of supersymmetry, its signature at the collider and possible relevance of string theory.