But that doesn't mean that all, or many, or most of today's attested languages couldn't descend perhaps from one that's much younger than that, like say 20,000 years, or something of that kind. It's what we call a bottleneck.
Ali to ne znači kako svi, ili puno, ili većina danas poznatih jezika možda ne vodi porijeklo od nekog koji je mnogo mlađi od toga, recimo 20,000 godina ili tako nešto. To je ono što nazivamo uskim grlom.