Researchers have quantified the true scale of Earth's underground fungal networks. Arbuscular mycorrhizal fungi—the microscopic threads that partner with plant roots—form systems so vast their combined length extends beyond the outer solar system. These fungal networks regulate nutrient cycling and carbon storage across every ecosystem on the planet, anchoring soil health and agricultural productivity. New research, reported by Ars Technica, reveals the staggering complexity hidden beneath our feet.

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