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Figure 1: Schematic diagram of the basic mathematical model (black arrows). Humans (friendly Canadians, in this example) can either die naturally or be converted into zombies — which is not terribly pleasant, but does come with that nifty jacket and tie. Zombies can reanimate the dead or be killed by humans (although it must be said that the latter doesnt bother them too much). Possible intervention include quarantine of the zombies (green arrow), a potential cure (blue arrow) or impulsive attacks (red arrow). Image courtesy of Robert Smith?/Mike Delorme [zombie photo]