This story originally appeared on PlanPhilly. Markward Playground is a small park near the Schuylkill River. I often go there for a walk or to look at the view, so I was upset to learn that this park ...

In Philadelphia, 30 parks and recreation centers are outfitted with a small speaker called the Mosquito. It blares a constant, high-pitched ringing noise all night long — but one that only teenagers ...

DARPA, the governmental department that researches crazy things that may eventually make it into the military, is currently working on an “ultrasonic curtain”. In layman’s terms, it’s a sonic cloaking ...

The rapid evolution of flexible and wearable technology has sparked a transformative era in the field of sonic devices, driven by advancements in materials science, engineering, numerical modelling ...