How the price of paint is set in the hearts of dying stars
Yonatan Zunger

I prefer the explanation that barns are red because in early America they were painted with a mixture of cow’s milk, lime and blood or rust, all of which were cheap, immediately available to farmers, and produced a durable paint. And this carried down to our own day as a cultural tradition long after blood paint was replaced with more modern formulations. No atomic physics necessary.

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