 Even though Popper’s particular proposals were flawed, his idea of comparing truth-content and falsity-content is nevertheless worth exploring. Several philosophers have developed variations on the idea. Some stay within Popper’s essentially syntactic paradigm, elucidating content in terms of consequence classes (e.g., Newton Smith 1981; Schurz and Weingartner 1987, 2010; Cevolani and Festa 2020). Others have switched to a semantic conception of content, construing semantic content in terms of classes of possibilities, and searching for a plausible theory of distance between those.