Imagine: it is 900 AD. You are in a great hall somewhere in northern Europe. In the center of the room is a vast open wood or peat fire where meat is roasting and a stew is bubbling in a large pot. The hall is warm — okay, it’s tepid — and the atmosphere is cozy, even sleep-inducing.
Oops! That warm, sleepy feeling is probably mild chronic CO poisoning, and you might have an asthma flareup from the soot. This cozy atmosphere could be deadly.
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