Dirt. For millennia, the dark, rich soil underlying farms and gardens worldwide has been central to human survival. It’s also a lot more complex than it looks. Within every clump of soil lies an ...

Living on a hill near a gravel pit in Draper, Utah, Adrian Dybwad can see the dust rise from the pit when a strong wind blows. "I just wondered how much dust was generated," he said. His curiosity led ...