Fire predates _Homo sapiens_.
Otzi the Iceman, from around 3300 BC, was found wearing very sophisticated cold weather clothing and boots, complete with nice soft underwear.
We’ve got evidence of sewing leather clothing far older than that.
Small windowless homes with thick walls are pretty easy to heat with even a small flame.
There are people alive who remember hearing stories from their grandparents about living in the Arctic without anything we would consider modern technology.
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