Oh wow, I read that book years ago (Hominids) - really enjoyed it... Same cover and everything ... His imagining of their family structures was great fun...After finishing the WWW series, I began reading The Neanderthal Parallax series by Robert J. Sawyer. While reading the final words of the WWW series, it struck me that the world we inhabit exists only as long as we continue to live in it; that is, once we die, everything is over for us. All our yearnings, achievements, wealth, and so on would come to an end with that. Our childhood is the best thing there is, as during that time, we are not truly conscious of our eventual death.
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I (very occasionally) pick up the odd bit of worked flint and as you handle it have wondered what the individual who dropped it would have thought had they knew that another type of human would pick it up 100,000 (ish?) years into the future and wonder about them ... perhaps it is an afterlife of sorts?