Even if you don’t like eating mushrooms, you’re in debt to fungi. One group of them, known as arbuscular mycorrhizal fungi, form vast subterranean networks of tubes called hyphae, hooking up with the roots of plants to exchange nutrients. Earth is so verdant in large part thanks to these partnerships, as this expansive infrastructure is associated with nearly three-quarters of all plant species. But because the network sprawls underground, it’s been difficult for scientists to determine just how much arbuscular mycorrhizal fungi is out there. (Good luck digging everywhere on the planet and taking samples.)

Scientists have developed a workaround, which has produced some astonishing numbers. Using machine learning models, they’ve estimated that worldwide, the arbuscular mycorrhizal network stretches for 110 quadrillion kilometers, almost a billion times the distance from Earth to the sun. (Scoop up just a teaspoon …

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