So this is what we're supposed to draw from the show, that our civilization was based off of some magic white people from space. Fuck that shit.
The language thing alone doesn't make sense. Guess what, Chinese and English and Swahili did not come from the same base space language. All of that shit about starting farms didn't make any sense either, irrigation systems etc were developed way later on. 150k years ago we were hunter-gatherers. The democracy thing? Guess what, the Greeks spent a long time not being democratic before that developed. So were Apollo and his douchebag descendants just keeping the secret of democracy to themselves before unleashing it in 148000 years later? Hell no. Don't even get me started on math concepts...math concepts!?!??! Argghhhhhhhhhhhhhh
Who cares? That's just specific nitpicking. Here's an answer: "genetic memory."
Damn, that Galen=Gaelic stuff is a great catch there. Chief says he's going to settle on an island off one of the northern continents that's cold, up in the highlands.
That's not an answer and you know it. Face it, the writers just thought it would be good to end it all on 'our' Earth with Hera as Mitochondrial Eve, and the surviving characters having a relatively happy peaceful ending. Fine, do that, but don't say shit like "We'll teach them language" or "I'm going to make a farm" because that's crap.