From: Spike Jones (spike66@ibm.net)
Date: Fri Jul 09 1999 - 19:39:43 MDT
> J W was thinking of things that travel through space:
> Light -- EMF
> Gamma rays -- EMF
> radio -- emf
> cosmic radiation -- emf
> other radiation -- emf
> Heat -- doesn't travel in space (radiation that produces heat does)
JW, other earlier forms of distance communication were also EMF.
smoke signals -- light (EMF) reflected from them is intercepted by our eyes
semiphore -- see above
sign language -- see above
Paul Revere's lanterns -- (one if by land, two if by sea, EMF)
Other than war drums, I cannot think of *any* long distance communication that
does not rely on EMF. The ETIs will grok this, I can assure you. spike
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