Matt Yglesias can talk about supervolcanoes and about Habsburg federalism and about the semiconductor industry in Taiwan vs. China. He can talk about regulatory sensitivities around geothermal drilling. He can talk normative ethics and the Ghent system and occupational licensing and maritime commerce in Westeros, the fictional realm of “Game of Thrones.” He can talk about all these things and, perhaps more importantly, he can sound like he knows what he’s talking about.