And no one knows for sure -- not even the dueling Upper West Side mothers.
No one knows for sure -- but 30 years of research does offer some experience and insights.
Most historians agree that Polynesian seafarers arrived around 400 AD, but no one knows for sure -- some have posited an extraterrestrial connection.
But no-one knows for sure what the consequences of a Greek exit would be, and whether it would prove to be significantly more expensive than the current path.
The club is reported to have had a maximum capacity of 2, 000 people, but no-one knows for sure how many people were inside at the time of the fire.
No-one knows for sure, but in his letter, Mr Chote makes clear that the OBR thinks the Eurozone and high energy prices have probably played the major role in growth turning out to be so feeble, not the planned austerity measures.
But there have been numerous official contradictory statements recently over when that trial will begin, and no-one really knows for now, says the BBC's Rana Jawad in Tripoli.
The state support awarded so far is supposed to get Magna-Opel off the ground, but no one knows if or when taxpayers will be reimbursed for their auto-investment.
No-one knew - or still knows - for sure what caused the vessel to sink.
But, as Graham notes, no one knows for certain just how large the innermost high-density region of such a supermassive black hole might be.
FORBES: Why Our Galaxy's Supermassive Black Hole Is Hardly The Source For A 2012 Doomsday 'Killshot'
Here, about 30, 000 families (no one knows for sure how many) crowd into a warren of hastily thrown-together shacks on the fringes of Ghana's capital: there is no power, sewerage or running water, diarrhoea and other diseases are rife and deadly fires rapidly take hold.
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