A teaspoon of healthy soil holds more life than humans, yet most species remain unknown

Beneath every footstep lies a world most of us will never see. A single teaspoon of soil, scooped from a healthy forest floor, holds more living organisms than there are humans on the planet, bacteria, fungi, protists and nematodes packed together in numbers that barely make sense on a human scale. Stranger still, the vast majority of these creatures have never been named or formally described. They work quietly out of sight, breaking down matter, cycling nutrients and holding entire ecosystems together, yet science has only begun to catalogue who they actually are. Christine Sprunger, Assistant Professor of Soil Health at Michigan State University, has spent her career trying to make sense of this hidden abundance, and what it means when it starts to disappear. Her research offers a rare window into a world that supports nearly all life above ground, despite going almost entirely unnoticed beneath it.How can a teaspoon of soil contain more life than there are humans on EarthSoil is often dismissed as inert dirt, yet it is one of the most densely populated habitats anywhere on the planet. Within a single gram, researchers can find billions of bacterial cells alongside vast fungal n...