And of course, there is the whole problem of defining and predicting intelligence.
And the lack of samples of early human DNA.
And the simple observation that hunter gatherers still exist, even if they're rare. While they're much better than we are at hunting and gathering (at least the kind of hunting that doesn't involve modern or medieval weapons), I've never heard of them being noticeably smarter than we are.
Quote:
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“I would wager that if an average citizen from Athens of 1000BC were to appear suddenly among us, he or she would be among the brightest and most intellectually alive of our colleagues and companions, with a good memory, a broad range of ideas and a clear-sighted view of important issues,” Professor Crabtree says in a provocative paper published in the journal Trends in Genetics.
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I'm pretty sure all he'd say at first would be "holy shit, what happened? What sorcery is this" in Ancient Greek.