Energy-time uncertainty principle

[bogz]

I have a few question about the uncertainty principle that I couldn't answer from reading wikipedia

http://en.wikipedia.org/wiki/Uncertainty_principle

an uncertainty relation arises between any two observable quantities that can be defined by non-commuting operators.

What makes operators non-commuting between two observable quantities? I understand a non-commuting "operator" but how are position and momentum (for example) non-commuting?


As for the ET uncertainty principle, what does that mean? Time is uncertain when you measure energy?? WTF?? I can't visualize that at all... What experiment did they do to see that relation?

 

[satown]

change your view into a simple understanding imagine it being like the fly between trains problem it seems to change as it moves in and out.