The study of invisible writings was a new discipline made available by the discovery of the bi-dimensional nature of Library-Space. The thaumic mathematics are complex, but boil down to the fact that all books, everywhere, affect all other books. This is obvious: books inspire other books written in the future, and cite books written in the past. But the General Theory of L-Space suggest that, in that case, the contents of books as yet unwritten can be deduced from books now in existence.
The universe doesn't much care if you tread on a butterfly. There are plenty more butterflies. Gods might note the fall of a sparrow but they don't make any effort to catch them.
Shoot the dictator and prevent the war? But the dictator is merely the tip of the whole festering boil of social pus from wich dictators emerge; shoot one, and there'll be another one along in a minute. Shoot him too? Why not shoot everyone and invade Poland? In fifty years', thirty years' ten years' time the qorld will be very nearly back on its old course. History always has a great weight of inertia.
People remember badly. But societies remember well, the swarm remembers, encoding the information to slip it past the censors of the mind, passing it on from grandmother to grandchild in little bits of nonsense they won't bother to forget. Sometimes the truth keeps itself alive in devious ways despite the best efforts of the official keepers of information.
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