Scientists have observed "coronae" on treetops for the first time, confirming the phenomenon occurs in the wild.

Basketball shoes on a gym floor, bicycle brakes in need of a tune-up, or the squeal of tires are everyday examples of squeaking sounds. Such sounds have long been attributed to stick-slip friction, or ...

"The screeching sound of peeling tape consists of a train of weak shocks that are generated when the transverse fracture ...