Paleontologists resist the idea that early humans called Neanderthals created any artworks. Their reasoning is sometimes circular.
The shift in tone from then to now is remarkable. What happened to the awe these systems used to inspire?
The extraordinary ensembles of natural environmental fitness described in my book are thoroughly documented scientific facts.
Being terrestrial is one obvious requirement. No fully aquatic species could master fire and thus develop metallurgy.
If the conductivity of copper were ten times less, wires would have to be ten times the cross-sectional area to provide the same conductivity.