Perhaps the first surprise in store for the new user of computers is that these powerful machines do not in general solve anything. We cannot (yet) walk up to a computer and ask it to solve a problem that it has not been preprogrammed to recognise, because human beings have to decide how the problem should be solved; the computer is then used to do the labour of the calculations. The machine is quite simply a robot, which follows exactly and blindly the instructions given to it.
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