Scalar anomalous dissipation is a phenomenon in fluid dynamics, when a quantity advected by a fluid (say, density of pollution particles advected by a water current) is dissipated even without assistance of viscosity. This behaviour can be seen as an extreme version of mixing; it has strong connections to turbulence: in particular to Kolmogorov's 'zeroth law', and to hypothesis of Richardson on turbulent trajectories. I will show that any scalar advected by a typical weak solution of incompressible 3D Euler equation exhibits anomalous dissipation. It seems to be the first anomalous dissipation result where the scalar is advected by a solution of equation of classical hydrodynamics. The talk is based on a joint result with L. Székelyhidi and B. Wu.