Of course no one can know for sure what the future holds, but we do know that bond markets, like stock markets, do change over time, and what works in one market environment may not work in future markets.

FORBES: 5 Reasons Why Bond Funds Can Help You Navigate Bond Market Headwinds Successfully

The Kommersant newspaper is already speculating that there are casualties, although no-one can know that for sure yet.

BBC: Russian media asks 'What happened?'

No one outside Apple could know that for sure, until today.

FORBES: Steve Jobs: Bad Day, Good Product

No one in Bonn seems to know for sure.

ECONOMIST: Germany comes out of its post-war shell

If there is one thing we know for sure, we will continue to have no idea of where Governor Romney really stands on both domestic and foreign issues because where he stands is a constantly moving target.

FORBES: Romney Foreign Policy Speech Brings More Lies And Reversals In Positions

In truth no one would have known for sure what he suffered from and we can't know either.

NPR: Book Traces Family Suffering from Deadly Insomnia

We can't imagine many people will be duped by the new, new iphone, but one thing we know for sure is that Apple ain't scared'a no trademark battle.

ENGADGET: New 'iphone' launches in Brazil, lawyers cancel Christmas break