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the dark beating heart of soil, built entirely from things that died beautifully.

means The dark, stable organic matter in soil, formed as plant and animal remains decompose, that gives fertile earth its richness and color.

from From Latin humus, simply 'ground' or 'earth' — the same deep root that gives us 'human' (the earth-born creature) and 'humble' (low to the ground). The food called hummus is unrelated: that comes from Arabicummuṣ, 'chickpeas.'

not hummusDecayed organic matter, not the chickpea dip
carbon vaultStores more carbon than all plants combined
slow buildForms over centuries, vanishes in years of plowing
holds waterCan absorb many times its own weight
life engineA single gram hosts billions of microbes
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