In recent years, scientists have discovered that the underground substrate of soil is home to a remarkably interconnected web of life called the “wood wide web.” Nearly 500 million years old, these mycorrhizal fungi networks are composed of millions of species of fungi and bacteria swapping nutrients between soil and the roots of trees. While the function and description of these networks is hotly debated among scientists, one thing is undeniable: fungi play a critical ecological role in our world, contributing to nutrient cycling, soil formation and plant health.