What’s with all the stuff about caves and “cavemen”? Reading the article itself shows they’re talking about huts with stone walls. “Cavemen” for early man is kind of a misnomer anyway — there aren’t that many caves to go around and never one when you need it while following the herds. People wouldn’t have lived exclusively in caves (though they would have certainly taken advantage of a nice dry one as opportunity permitted). But temporary shelters like huts, lean-tos, wigwams, etc. weren’t preserved, while caves did preserve human artifacts (most spectacularly the cave wall paintings in France). So there was a selection effect. Artifacts in caves were preserved and thus found, while everything else was lost or harder to find, and so the impression got into the popular mind of “cavemen.”
All I know is that I was spectacularly disappointed by the abrupt cancellation of the “Cavemen” sitcom.