The invaders brought almost nothing that was new—just a language and their own DNA. No aspect of their technology or mode of living offered even a moderate improvement over what existed already. They can’t have been well liked. They don’t seem to have been very impressive. Yet somehow they made such a profound impact that their culture remains with us, more than a millennium and a half later, in the most extraordinary and fundamental ways. We may know nothing of their beliefs, but we still pay homage to three of their gods—Tiw, Woden, and Thor—in the names of our three middle weekdays, and
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