Somehow and no one's sure how these insects know when it's time to surface and become adults.
No one's sure yet what the Olympics will mean for the East End.
Despite the French defence minister's comments, no one can be sure what will be sold in future.
Still, as elsewhere, the main burden falls of care on women, there are tensions between generations, and no-one is sure that today's teenagers, growing up in a more individualistic culture, will want to take their turn as carers in twenty years' time.
Even so, no one can be sure of either party's plans.
ECONOMIST: Which party is least likely to make it sick again?
No one is sure whether, from Israel's current perceived position of strength, he genuinely wants a lasting peace that would give the Palestinians a proper state.
No-one is quite sure what exposure Spain's regional banks have to housing debt.
But one thing is sure there's no way I'm going to end up in the goldfish bowl.
To be sure, no one is writing off China's retail sector, with retail sales still growing at 12.8% year over year in April.
By limiting the subsidy to a quarter of the drop in a worker's hourly wage, Mr Kling makes sure no one is rewarded for simply putting in fewer hours.
You know where there's a problem, you make sure that know no one else knows where the problem is.
"No one can volunteer at a library or a Sure Start centre if it's being closed down, " he said in an article for The Independent on Sunday.
BBC: Prime Minister David Cameron defends Big Society policy
Conflicting arguments about its progress appear in this week's Nature journal which admits in an editorial that no-one can yet be sure of the truth.
BBC: NEWS | Science/Nature | Voyager 'at edge of Solar System'
We are sure of one thing: Google's lobbying expenses had no effect on the care, diligence or analysis of the agency's incredibly hardworking staff or on the decisions reached by any of the FTC's five commissioners.
WSJ: Lobbying Didn't Influence the FTC �� Letters to the Editor
I'm sure no one in the White House thought my comments on Chuck Hagel's confirmation hearing were necessarily pro-Obama.
The truth of the matter is that no one can say for sure how many companies will be caught up in the CWC's reporting, regulatory and inspection regime.
One thing is for sure -- there will be no American winner with the U.S. team failing to qualify a man for the finals of the blue riband event for the first time in history.
But just to be sure no one ever again tries to restrict free-spending pols, the state's hoodlumesque attorney general, Drew Edmondson (Dem.), has decided to seek to imprison the petition leaders.
When no-one is sure whether it is the accused or the accuser who is guilty of blasphemy, it's easier to avoid a mob situation.
Deputies from the local sheriff''s office and town officials conducted a search of the school and its grounds to make sure no-one else was involved and all other students were safe.
BBC: Californian teacher talks student out of school shooting
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