I remember reading about that in Nat. Geographic, Tindo. If I remember right, there was some discussion about "modern" humans living in the same time period and whether they knew about each other. Also discussion on why the Homo floresiensis did not survive after about 15,000(?) years ago. I believe the theory was that because they were such a localized civilization that a catastrophy of some kind (volcano? earthquake?) wiped them out. Very interesting stuff!