In this episode of Talk Nerdy, Cara re-records her lost episode with scientist and author Laurie Winkless!  They bemoan the loss of Cara's laptop while discussing Laurie's new book, "Science and the City: The Mechanics Behind the Metropolis." Topics include how cities manage increasing water demand, Laurie's favorite feats of engineering, and a disgusting byproduct of human refuse, the "fatberg." Follow Laurie: @laurie_winkless.