Abstract: In this talk, I will discuss how the quantum mechanics of Bloch electrons – the geometry of their wave functions - manifests itself in the observable properties of materials. Drawing intuition from the classic example of the anomalous Hall effect, I will discuss transport and optical phenomena in gapless topological systems, represented by the Weyl semimetal, as well as other metals with nontrivial band geometry. Primary focus of the discussion will be on the physical manifestations of the chiral anomaly and chiral magnetic effect in nonlocal transport, and optical activity of metals. I will also briefly touch upon the nonlinear transport and hydrodynamic properties of topological metals.