These tiny drones are powered by sound

The MICROBS Lab’s microfliers. 2026 EPFL/MICROBS – CC-BY-SA 4.0. By Celia Luterbacher When you blow air across the neck of a bottle, you’re not just producing a pleasant tone: you’re also demonstrating a phenomenon called Helmholtz resonance. This occurs when airflow passing across an opening causes air trapped inside a cavity (like a glass bottle)…