I trust that everything described is possible. In other words, we'll be making an assortment of weapons long before we can evolve claws as effective as daggers. I sincerely doubt that an apocalypse that doesn't destroy life on earth down to the ants will be so harsh that man can't recover technology faster than the pace of evolution. Most significantly, none of these 'men' after an apocalypse are civilized. But the forms shown aren't like that, and most seem entirely implausible to me: the massive sloth, for example, feeds its bulk on leaves in a temperate climate - but we all know leaves are low-calorie, so how do these folks survive winter? I wanted more about how we'd naturally evolve, if we could adapt to Climate Change (not fast enough, of course, but still.) and if we'd get the big brain & feeble limb form that is popular among older SF writers. I see a lot of genetic engineering in the first half of the book, and that is not what I'm interested in. He reports, from a thorough scan but not an every word read, that it's only mildly interesting and that the Hood and Dixon did not always agree on details. Seemed less appealing when I picked it up, so I had my son 'guinea pig' it for me. I've had this on my list for awhile, seemed intriguing.
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May 2023
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