Markets are not perfect and as well as the arbitragers perform, timing differences remain.

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Sales ounces were lower than production in the third quarter of 2012 because of normal timing differences in inventory flows, they said.

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At the same time, however, it is almost impossible to contemplate large projects without debt, nor to smooth over the minor ups and downs of the economic cycle and the timing differences between tax receipts and spending demands.

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Given the dramatic differences in timing, it would be reasonable to assume the 4G PlayBook will be released before the 4G EVO View.

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The team found significant differences in timing of when girls or boys would look at the eyes, suggesting they aren't following the same cues.

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The trials are likely to be long and difficult: Because of the murky and variable nature of depression, it is difficult to measure antidepressant effectiveness at all, let alone subtle differences in the timing of effectiveness.

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In a follow-up experiment, Dr Fonken looked at whether the timing of food consumption alone could explain the observed differences.

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By timing how long the signal takes to make the return trip, the instruments can determine differences in height.

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"When you back down into the specifics of the timing of when and if Iran decides to pursue a nuclear weapon, there may well be some differences, " he said.

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