[mannykannot]

As someone who knows nothing about linguistics, I was surprised that the article expressed surprise that "[these root words] can be predicted from information independent of their sounds. We showed in a sample of Indo-European languages that the frequency with which a word is used in everyday speech, along with its part of speech, can predict how rapidly words evolve, with frequently used words on average retained for longer periods of time."

I would have guessed that, on the basis of utility, the conservation of words would fundamentally be a function of their meaning, and, for the most part, that function would be fairly constant across all human cultures, regardless of the specific languages used by those cultures (again on grounds of their utility.) From that perspective, would it be all that surprising if approximately the same set of meanings were conserved even in languages with no common history?