Mr Haldane uses the analogy of dogs, such as border collies, which are very reliable catchers of Frisbees without being aware of the complex calculations (wind speed, air resistance, etc) that might be involved.

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Other adapters can do some of that, but its final trick is the piece de resistance: increasing the speed of a lens by a full stop.

ENGADGET

"There was a little bit of resistance at first when they talked about speed reductions, " he said.

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Nothing, we now know, creates as much fatigue, as much resistance, as much anger and as much resentment as the imposition of an alien speed, an alien rhythm and an alien attention span.

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But this resistance has not extended to obvious defensive measures such as dynamiting bridges. (The invasion's speed, coalition warnings, disruption of Iraqi communications, and a lack of initiative among Iraqi officers may explain these rudimentary failings.) Even those troops who defended Baghdad have mainly done so with more fanaticism than technique.

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