Darren New wrote:
> scott wrote:
>> I wonder how many photons typically exist? 
> 
> Mu.
> 
> That is the answer that unasks the question.
> 
> The question doesn't make sense to ask. If you didn't look at the 
> photon, it might or might not have existed. Then there are virtual 
> photons, which come and go, which by definition you cannot look at.
> 
> There's probably some statistical thing that'll tell you some expected 
> numbers, but it's not really the same question.

How about gravitons then? :-D

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