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The issue with the impact hypothesis is that the megafauna dieoffs didn't happen at the same time on each continent, which would be the case if a single massive event was responsible. "Humans arrived to the Americas later, and America's megafauna vanished later" is something that should rightly...

Actually I was talking about North America specifically when I mentioned those graveyards. Not that Eurasia was any better, it had its fair share of megafauna, but spikier than North America. Including giant crocodilians that lasted until the late miocene/early pliocene...

And yet we can find massive graveyards of those animals where hunter-gatherers casually killed them in job-lots. Note that one of the leading theories as to what caused the Quarternary Extinction is that we ate them all. We've got multiple records of entire mammoth herds driven into a canyon...

Eh... handwavey. The Hunter/Gatherer stage was one of the peaks of human civilization. They basically worked maybe fifteen hours a week (estimates vary between 8 and 20 hours a week, depending on the terrain). That level of civilization can't actually support dense numbers of humans but...

Bronze requires a really high-end trade network since the component elements don't often appear together (There're exactly three such deposits on the planet, one in Cornwall in the UK, one in Thailand, and one in Iran). Africa's always suffered from the fact that it has a lousy river network to...