Uncle Bill,
Well, no, actually. The difference from the Tower of Babel story is approximately equivalent to the difference of evolution from the Biblical creation story, though at this point, the evidence for common linguistic descent is a lot weaker than the evidence for common biological descent.
Basically, the idea is that human languages diverged from a single common ancestor language at the same time that the human population dispersed from a homogeneous population in Africa around 50,000-? years ago and that you can trace a good deal of that divergence even using the (now sparse) data in the resulting modern languages. The position is controversial (especially the part about being able to use modern language data to reconstruct a linguistic family tree), but it isn't crazy.
It
would be crazy for me to go into a major explanation of (my take on) the evidence and conclusions that can/should be drawn from it, but a pretty good presentation -- not too technical, IMHO
-- by one of its principal exponents can be found in
The Origins of Language by Merrit Ruhlen. Wiley, 1994. ISBN: 0471159638. I got mine from Powell's Books in Portland, OR
http://www.powells.com . I just checked and they don't seem to have any used copies in stock, so you might have to pay full price there right now, but you can always keep checking.
Amazon.com
http://www.amazon.com/exec/obidos/ASIN/0471159638 also has it at $14.36 (+s&h)
It's pretty fun reading, but, then, I often read this sort of thing as bedtime reading. YMMV.
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Paul Neubauer
prn@bsu.edu
[This message has been edited by prn (edited 12 August 1999).]