“From cows” is what I said when my youngest son asked me. It was posed during his litany of questions as he’s driving down the gauntlet of Time For Bed Boulevard. He knows that if it’s the right night and he asks the right question he can suck me into his sleep avoidance. Alas, he was unsuccessful on that night, but his question got me thinking. I knew I had seen it asked in MinuteEarth Explains, How Did Whales Get So Big?, but in the heat of his bedtime minute, I couldn’t come up with a more precise answer. The specific answer to his question will completely surprise you, as well as admire the ways it’s marketed.
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