The Rules of Contagion: Why Things Spread - And Why They Stop: by Adam Kucharski BASIC BOOKS, 2020, 352 PP., US$30.00, ISBN-13: 978154167431 Furthermore, in the context of fear transmission, an important realization over the past decade is that while contagion in social systems and disease transmission were initially considered similar, they are now known to be substantially different. Moreover, when describing social contagion in terms of epidemiological concepts, Kucharski tends to focus on the similarities between the various kinds of contagion, often leaving out important differences. [Extracted from the article]