It is said, for example, that dragons can sometimes have seven heads. This is sheer nonsense. A dragon can have only one head, for the simple reason … - Stanisław Lem

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It is said, for example, that dragons can sometimes have seven heads. This is sheer nonsense. A dragon can have only one head, for the simple reason that having two leads to disagreements and violent quarrels; the polyhydroids, as the scholars call them, died out as a result of internal feuds. Stubborn and headstrong by nature, dragons cannot tolerate opposition, therefore two heads in one body will always bring about a swift death: each head, purely to spite the other, refuses to eat, then maliciously holds its breath — with the usual consequences. It was this phenomenon which Euphorius Cloy exploited when he invented the anticapita cannon. A small auxiliary electron head is discharged into the dragon's body. This immediately gives rise to unreconcilable differences of opinion and the dragon is immobilized by the ensuing deadlock. Often it will stand there, stiff as a board, for a day, a week, even a month; sometimes a year goes by before the beast will collapse, exhausted. Then you can do with it what you will.