As the initial hot lava of this thread cools into porous volcanic rock, now seems a good time to thank all our scientists for lending your expertise to the discussion.
I learned a lot from you, as always; I know other readers have as well. Maybe some of the material you've deposited here can be profitably mined in the future by Great Debate participants and make their work a bit easier.
None of this is to preclude the possibility of a new eruption here. I'll be watching for tremors.
Many thanks.
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Archer
All species are transitional.