It isn't clear when he got the idea--he mentioned it to a friend as early as November 1988--or what he thought he had to offer besides his stewardship of unsuccessful oil companies.
It isn't clear how the treatment helps Alzheimer's patients, but it appears to take advantage of antibodies from the plasma donors that combat a protein called amyloid, which clumps in the brains of people with the ailment.
Still, it isn't clear that Ro knows how unprincipled she is, or that the Courier knows how disreputable it is, for the movie itself has a smarmy tabloid soul.
The Kelleys' lawyers say it isn't clear what authority, if any, the government used.
Historically, it isn't clear that the choice of a vice president matters very much at all.
CNN: Ryan pick will steer Romney campaign to treacherous waters
It isn't clear how many of Walgreen's 7, 700 stores are affected by the move.
It isn't clear whether Mr. Zaw Zaw's businesses are wholly or only partly owned by him.
WSJ: Singapore Stymies Myanmar Mogul Zaw Zaw's Bid for Listing
It isn't clear which country's passport Tamerlan, who wasn't a U.S. citizen, used to travel.
WSJ: Boston Suspect Tamerlan Tsarnaev's Dagestan Visit Scrutinized
It isn't clear if Mr. Paulson has adjusted his gold-derivative positions, which are considered large.
It isn't clear how many Facebook shares will be sold as part of the deal.
It isn't clear whether Gilead will pursue permission to market the drug for HIV prevention.
It isn't clear if the latest guidance would apply to a merchant's online scrip.
It isn't clear if the Justice Department considers the matter resolved or still open.
Discrimination could also be a factor, though it isn't clear how much, he said.
WSJ: Women Now Constitute One-Third of Nation's Ranks of Doctors, Lawyers
No reason was given, and it isn't clear how long the ban will be enforced.
It isn't clear whether providers will drop plans, increase premiums or make other changes.
It isn't clear exactly how big the consumer reaction to the white cans was.
WSJ: A Frosty Reception for Coca-Cola's White Christmas Cans
It isn't clear why the U.S. has never developed a European-style youth hostel culture.
But it isn't clear yet how many of the 7, 000-strong at-risk group have now been fully vaccinated.
It isn't clear who made the final decision or whether the concerns of local officials reached London.
WSJ: U.K. Officials in China Expressed Early Concern About Death
It isn't clear precisely what wireless services the cable operators intend to offer via the WiMax venture.
Brixmor has reduced some of that debt, but it isn't clear how much debt the company currently has.
It isn't clear how many firms would be able or willing to participate in capitalizing the bad bank.
It isn't clear which firms are selling wheat to Iran currently, but major grain shippers Bunge Ltd.
It isn't clear which film was the first to start showings before 12:01 a.m. on its opening day.
But it isn't clear that regulators and banks would be more adept than agencies at judging such risks.
ECONOMIST: Reducing reliance on ratings is a worthy goal, but not easy
It isn't clear why Facebook decided to tell potential investors that it intends to breach the 500-shareholder limit.
It isn't clear how much help the abstainers will offer Washington in crafting the marketplaces and recruiting customers.
It isn't clear exactly how the hackers broke in to the Chamber's systems.
It isn't clear whether the person worked inside the Journal and whether the informant provided names of alleged bribers.
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