Quote Originally Posted by Lt. Columbo

adults and teens cannot acquire language like a child. period.
get over it. that part of the brain is closed for ever and there's nothing you can do about it (and it has nothing to do with them having 'more time'). during the key years of language acquisition the brain is an extremely busy place.
I'm curious how you know this. Did you do some sort of secretive research on this?

I'm not at all defending Rosetta Stone. I've never seen it demonstrated and it sounds like it is overpriced for whatever it is. I'm just someone interested in the subject of second language acquisition.