Mass and energy balances are like keeping strict account of every thread that goes into my loom and every bit of warmth from my hands that goes into the silk. Recycle streams? That is my leftover yarn I cleverly work back into the border of a shawl. Degrees of freedom feel like the frustrating gap between the money I have and the price of my son's spectacles—too many constraints, not enough choices to make things right. In my textbook, it is a clean formula, but in my lane, it is the stubborn reality that never quite balances.
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