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In Heft-Neal et al. we are only shown regression lines and not a single one of the data points they're based on. Forcing a linear regression on arbitrary data will always yield a result and as fig. 2c shows it's mainly driven by the presence or not of Saharan dust. For all the rest of Africa the correlation my well be negative and for West Africa the north-south gradient affects many other values besides dust. There may well be something in it, but a
„robust relationship“ it's not.
Franklin provides a very convincing solution to the riddle of Jerusalem's salvation under Hiskia.
Meyer et al. provide one more proof for real warfare already in the Neolithic. The time, when Keeley’s was an outsider position, is long gone and I'm convinced that Meller’s Bronze Age armies deserve to be taken more seriously than they often are.
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