The authors note that it is not yet known why women with AF are more susceptible to stroke.
It is not yet clear why investors have started to return.
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We may not yet know why it benefits the brain, but few things are simpler or cheaper or less risky than tossing a stick in your mouth for a good chew.
Dr Allan Pacey, senior lecturer in andrology at Sheffield University, says experts do not yet know exactly why.
But the simulation has not yet found the reason why it did so.
It would be wise to note how much has not yet happened, and why Ulster's halting progress towards peace and normal politics has much further still to go.
We're not there yet (and I'm not sure why we'd want to get there).
Beyond describing it as a "hardware" issue, RBS has not yet been able to explain why its systems failed.
However, it appears that untagging is not yet available, which is why the tagging is limited to just friends for now.
Better yet, why not have the bill force the U.S. to withdraw money already deposited with the IMF until such a change is enacted?
We do not yet have the answers as to why these people were murdered.
Mr Marston said some homes could have been closed for a number of years, which was why police were not yet revealing the names of institutions and individuals under investigation.
Still on a busy day, especially when markets are volatile the settlements office may not find out about the trade until the counterparty calls them days later asking why the deal has not been settled yet.
Yet the real question is not why he won, but why Mr Bondevik lost.
Baskin also said he believed Husseini was the reason why the intifada had not yet reached east Jerusalem.
Mrs Overend wanted to know why the DUP had not yet sought to address the matter in the executive.
Their presence in Kidal explains why government troops have not yet been sent to the town, our correspondent adds.
BBC: French troops in Mali take Kidal, last Islamist holdout
It is unclear why its troops have not yet captured the base.
Mr Uribe himself says that the improvement in security is not yet irreversible and that is why he is seeking to change the constitution to run for a third term.
Exactly why mice sing is not yet known, but given that the males are stimulated to sing when they smell female pheromones, it seems likely that it is to do with sex.
ECONOMIST: Male mice sing when they scent the female of the species
What has not been told yet is the story of why Sounders ticket holders have turned out in such great numbers, as well as the personal stories of those who experienced the most successful expansion franchise in MLS history.
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In response to criticism from other Labour members, including Liverpool Wavertree MP Luciana Berger, who asked why the government had not yet acted after two years in power, the secretary of state said that "it would have been nice have a bit more cross-party support" on the issue.
And the second reason why the awful business seems not yet over?
Even so, why is the minimum wage not yet denting employment?
That they have not yet done that is clear, which is why we continue to work with our international partners to intensify the pressure, to intensify the sanctions.
That is supposed to be a job for the politicians - which is probably why we have not heard anything yet about ECB president Jean-Claude Trichet buying Italian debt, or Spanish.
The Arizona state senator who sponsored SB1070, Russell Pearce, is also Mormon, which has led to speculation that this is why the Mormon Church has not yet expressed a moral opinion on the matter.
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