If you've ever played online games, then you probably know about lags firsthand. A missed shot that should have hit the target; a ball that sharply changes direction right in the air; you suddenly find yourself a few steps back in the place where you were a second earlier. There is nothing supernatural about this: these are common artifacts of systems that provide co-operation with people from other countries almost as effectively as with a roommate. At least most of the time.
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