Knocking a drone out of the sky is sometimes possible using an invisible weapon—sound. The vulnerability in some drones comes from a natural property of all objects—resonance. Take a wine glass: if a ...

In a cramped apartment in the Ukrainian capital Kyiv, Pavlo, a 30-year-old drone operator who had recently returned from the front, unzipped a black case about the size of a pizza box. Inside, there ...

Pavlo experienced drone warfare. "You are being hunted," he said. In a cramped apartment in the Ukrainian capital Kyiv, Pavlo, a 30-year-old drone operator who had recently returned from the front, ...