On Tue, 28 Feb 2012 20:25:00 +0000, Bernard Peek wrote:

Yes, but as I pointed out in the post to which you replied absence of
evidence is not evidence of absence. You can know that you haven't
detected a change, but you can't know that there is no change. Absence
of a change is not detectable.

Pfft. Just look harder.

Alice in Wonderland: "I can see nothing."
Cheshire Cat: "My, you must have good eyes!"


Thomas Prufer