Actually, the reconstruction of Proto-Indo-European and the rules by which
it developed into languages ranging from ancient Greek and Sanskrit to
modern English and Romance languages are well established and accepted by
mainstream scholars. There's no way I can even summarize this work, or the
explanation of why it's scientifically valid, here, but there are many books
and encyclopedia articles available on it for those who want to investigate
the subject. I will however note for those interested that there have been
several attempts by scholars to reconstruct what PIE probably sounded like;
one (actually several in different versions) easily available on the
Internet is at:
http://en.wikipedia.org/wiki/Schleicher's_fable
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