Too many non-European commentaries follow a beguilingly simple logical path, which goes like this: the single currency is vulnerable in a crisis because it was created without a single government above it to control tax, spending and transfers between the euro zone's richer and poorer economies.

ECONOMIST: Charlemagne

Still, even to non-technical people, it was clear that there were logical processes that controlled the gears of mechanical systems or the circuits of computers in ways that were useful and not, at the time, obvious.

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