Subject: A problem with theHeisenberg uncertainty principle

My problem is that some books refer to the principle as if it doesn't depend on 
the experiment. The principle states that one cannot measure both the speed and 
the position of a particle with great accuracy. In every explanation I have 
read it is so because measuring this itself changes either position or the 
speed of a particle. But some authors use Heisenberg's uncertainty principle 
without the "measurement" part - they say that, for example, the position of a 
particle cannot be ABSOLUTELY certain, it must be at least a bit uncertain. Or 
they say that if the position is certain, the speed must be uncertain. Isn't it 
that both the speed and the position of a particle are certain, but you just 
cannout MEASURE both of them accurately?

Re: A problem with theHeisenberg uncertainty principle