New technology enables us to perceive sounds beyond human hearing range, allowing a new perspective on our place on the planet.

Researchers describe an acoustic meta-surface that uses pingpong balls, with small holes punctured in each, as Helmholtz resonators to create inexpensive but effective low-frequency sound insulation.

Millions of hedgehogs die as they cross the roads, but a discovery is paving the way for a warning that might stop them crossing at dangerous times.