That would help to explain why they vary so much from country to country.
That would help to explain a puzzling anomaly about comets: they fall into two classes.
Decision fatigue may also help to explain why even strong leaders can sometimes seem paralyzed by indecision.
Both of these factors may help to explain why Scandinavian economies combine big spending and reasonably vibrant growth.
These arguments help to explain why the Chinese have so far ignored American demands to revalue their currency.
That Credit Suisse's boss, Brady Dougan, has an investment-banking background may help to explain why it has done a better job.
Among other things, such contradictions help to explain the American attachment to religion that puzzles many in Europe.
Concerns about maintaining decent levels of capital help to explain why the transaction is largely in shares, not cash.
This might help to explain why so much legislation is simply so awful.
This may help to explain why investments in information technology have failed to push up productivity growth, unlike in America.
Strong community health care and good coverage by public health programmes help to explain why Nordic countries rank so highly.
Messrs Alesina, Glaeser and Sacerdote think this principle might help to explain why Europeans work so much less than Americans.
That may help to explain why gold and Treasury bonds both performed so strongly in the third quarter, an unusual combination.
This may help to explain why the Bush administration is working with such great zeal to keep a focus on terrorism.
The subtle Berlusconisation of Italy may help to explain a trend that has swept the country in the past 12 months.
The area's leftist past may also help to explain a growing resentment about the huge income disparities of the Seattle region.
But their prevalence does help to explain why commissioners often find the transition back to national politics somewhat difficult to manage.
That large reserves of oil and gas lie beneath these outcrops might help to explain the extraordinary interest in their well being.
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This may help to explain Mr Medvedev's greater willingness to consider sanctions.
There is one other factor which could help to explain the rise.
Monkey behaviour may help to explain why middle managers suffer the most stress at work, according to a study at two leading universities.
It help to explain why wisdom is such a key leadership quality, and why people feel at risk when they are led unwisely.
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Inflows on that scale would help to explain why the euro has continued to do better than many expected given the zone's sovereign-debt crisis.
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That may help to explain why highly professional, educated people that were not known before to police are being caught in possession of the material.
Sinn Fein's southern ambitions help to explain why Gerry Adams, the party's leader, has chosen not to taken a position in the Northern Irish executive.
This, in turn, might help to explain different temperature lag conclusions.
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Traditional Chinese attitudes toward replication also help to explain the trend.
Mr Schmieding thinks that Germany's high costs relative to what it produces help to explain why unemployment has risen from cycle to cycle since the 1960s.
This could help to explain how the Vikings were able to navigate across large tracts of the sea - well before the invention of the magnetic compass.
The increased demands help to explain how the two most recent American commanders in Afghanistan, among the most respected four-star officers of their generation, lost their jobs.
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