You Wrote:

However, THIS is a very severe question to you guys: all speak about the speed of
light.
And all know what, even the man with the hanging tongue and Noble Prize. But nobody
speak
about the speed of dark! So, what's speed of dark?

Ingemar


I would have thought that "dark" was just a concept, depending on what and how you
are trying to "see". An image intensifier
can help you "see" in light conditions so low you connot see with the naked eye.
Alternatively no visible light is required
to see with a thermal imager, but the thermal imager converts infra red radiation
to visible light on a TV screen. Furthermore,
a Magnetic Resonance Imager depends on the emission of something that can register
in the electromagnetic spectrum
(I forget if its a phonon or whatever) after application of a magnetic field.

In summary, blah blah blah, I've successfully avoided the physics of it, but
depending on how you look at things, you will
never be in the dark!

Richard

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