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71 " Working simultaneously, though seemingly without a conscience, was Dr. Ewen Cameron, whose base was a laboratory in Canada's McGill University, in Montreal. Since his death in 1967, the history of his work for both himself and the CIA has become known. He was interested in 'terminal' experiments and regularly received relatively small stipends (never more than $20,000) from the American CIA order to conduct his work. He explored electroshock in ways that offered such high risk of permanent brain damage that other researchers would not try them. He immersed subjects in sensory deprivation tanks for weeks at a time, though often claiming that they were immersed for only a matter of hours. He seemed to fancy himself a pure scientist, a man who would do anything to learn the outcome. The fact that some people died as a result of his research, while others went insane and still others, including the wife of a member of Canada's Parliament, had psychological problems for many years afterwards, was not a concern to the doctor or those who employed him. What mattered was that by the time Cheryl and Lynn Hersha were placed in the programme, the intelligence community had learned how to use electroshock techniques to control the mind. And so, like her sister, Lynn was strapped to a chair and wired for electric shock. The experience was different for Lynn, though the sexual component remained present to lesser degree... "

, Secret Weapons: How Two Sisters Were Brainwashed to Kill for Their Country

78 " 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