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4 " A thug. In peacetime Fitch would be hanging around a pool table giving the cops trouble. He was perfect for war. Tibbets had chosen his men well - most of them, anyway. Moving back past Haddock January stopped to stare at the group of men in the navigation cabin. They joked, drank coffee. They were all a bit like Fitch: young toughs, capable and thoughtless. They're having a good time, an adventure. That was January's dominant impression of his companions in the 509th; despite all the bitching and the occasional moments of overmastering fear, they were having a good time. His mind spun forward and he saw what these young men would grow up to be like as clearly as if they stood before him in businessmen's suits, prosperous and balding. They would be tough and capable and thoughtless, and as the years passed and the great war receded in time they would look back on it with ever-increasing nostalgia, for they would be the survivors and not the dead. Every year of this war would feel like ten in their memories, so that the war would always remain the central experience of their lives - a time when history lay palpable in their hands, when each of their daily acts affected it, when moral issues were simple, and others told them what to do - so that as more years passed and the survivors aged, bodies falling apart, lives in one rut or another, they would unconsciously push harder and harder to thrust the world into war again, thinking somewhere inside themselves that if they could only return to world war then they would magically be again as they were in the last one - young, and free, and happy. And by that time they would hold the positions of power, they would be capable of doing it. "

Kim Stanley Robinson , The Lucky Strike

8 " From a philosophical point of view, Leibniz's most interesting argument was that absolute space conflicted with what he called the principle of the identity of indiscernibles (PII). PII says that if two objects are indiscernible, then they are identical, i.e. they are really one and the same object. What does it mean to call two objects indiscernible? It means that no difference at all can be found between them--they have exactly the same attributes. So if PII is true, then any two genuinely distinct objects must differ in at least one of their attributes--otherwise they would be one, not two. PII is intuitively quite compelling. It certainly is not easy to find an example of two distinct objects that share all their attributes. Even two mass-produced factory goods will normally differ in innumerable ways, even if the differences cannot be detected with the naked eye.

Leibniz asks us to imagine two different universes, both containing exactly the same objects. In Universe One, each object occupies a particular location in absolute space.In Universe Two, each object has been shifted to a different location in absolute space, two miles to the east (for example). There would be no way of telling these two universes apart. For we cannot observe the position of an object in absolute space, as Newton himself admitted. All we can observe are the positions of objects relative to each other, and these would remain unchanged--for all objects are shifted by the same amount. No observations or experiments could ever reveal whether we lived in universe One or Two. "

Samir Okasha , Philosophy of Science: A Very Short Introduction