On 26 Feb 2007 at 12:51, der Mouse wrote:
  But see also The Decipherment Of Linear B; we
don't _always_ need a
 Rosetta Stone to suss out a lost language - while admittedly that case
 was a known language in an unfamiliar writing system, it was mostly
 deciphered before this was realized. 
...and it took a very long time to get to that point--about 50 years,
I think.  But some alien civilization not even familiar with any of
our languages would be at a distinct disadvantage.  At least the
decipherers of Linear B determined it was Greek (Mycenaean) a known
language.  One wonders, for example,  what an ancient Greek would
make of a modern Korean engineering text.
Cheers,
Chuck