ILLEGAL CONSUMPTION OF NARCOTIC DRUGS, PSYCHOTROPIC SUBSTANCES, AND THEIR ANALOGUES CAUSES HEALTH DAMAGE, THEIR ILLEGAL TRAFFICKING IS PROHIBITED AND ENTAILS LIABILITY ESTABLISHED BY LAW. Why do financial bubbles grow so rapidly? Why are disinformation companies so effective? Why is it so hard to stop outbreaks of violence? How to explain the contagiousness of loneliness? What makes content viral? It turns out that the spread of almost everything — from infectious diseases to fashion trends and innovative ideas — obeys the same laws. These laws are explained in a simple, clear, reasoned, and extremely fascinating way in this book by mathematician and epidemiologist Adam Kucharski, whom The Guardian called "the voice of reason" amid the coronavirus madness.