 I'm Mary Childs, and today on Planet Money, how three novelists injected economic reality into their fiction. And I'm Guy Raz. Later on How I Built This, I talked to Cody Finke, an entrepreneur with a chemistry background, about how his company Brimstone uses an entirely new process of making cement, because the current process is a carbon emissions nightmare. The majority of the CO2 emissions from cement come from that chemistry. We're releasing the CO2 from the rock. Wow.