Piotr Sulkowski visited on Friday 1st  November from the University of Warsaw, to give a colloquium talk on “From random matrices to RNA interactions“.  The talk discussed the triple interface between mathematics, physics and biology.  An abstract follows: the theory of random matrices plays an important role in various branches of mathematics and physics. An important achievement in recent years – by Eynard and Orantin – was finding a solution to a large class of matrix integrals in terms of the so-called topological recursion.  In this talk the theory of random matrices and the topological recursion are used to determine a classification of topological configurations of interacting RNA molecules.