Below the surface on which all our human feats and follies unfold, arbuscular mycorrhizal fungi form a vastly interwoven matrix. “The signals say: A good answer is worth reinventing from scratch, again and again. They say: The air is a mix we must keep making. They say: There’s as much belowground as above. They tell her: Do not hope or despair or predict or be caught surprise... [3320 chars]