Thermoregulation is how an animal maintains its internal heat, with birds being endothermic, generating their own warmth, and snakes being ectothermic, relying on the sun. But I see it as a question of metabolic cost and efficiency. My work with metabolic diseases shows that the line blurs; a poorly functioning thyroid in a human is its own kind of ectothermy, a chilling internal winter no boiler can fix. I think of this every time I light the wood stove to heat dye water, feeling that expensive, struggling burn to stay *sanchai*.
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