"Move over, Lucy."
I'm new here <insert nervous wave of acknowledgment to rest of the forum> but I figured some of you fine folks could maybe answer some questions I have surrounding Ardi.
I'm not really sure why all of the news sources are saying "This is crazy; this changes everything" when as far as I can tell Ardi is entirely something to be expected for that point in humanity's evolution. She's not the common ancestor of humans and chimpanzees-- she came along about 2.5 million years after that ancestor (and so after those species diverged), which is a pretty big chunk of time considering that Lucy only came along about a million years after Ardi and yet she had shorter arms, a bigger brain, and was full bipedal.
So it's probably very likely that the actual common ancestor was, if not exactly half human and half chimp, at least significantly more chimp-like than Ardi. Right?