It's the sound of water droplets falling one after another, maybe from a leaky faucet or through a cracked ceiling. It's the kind of sound that can keep you up all night. University of Cambridge ...

This blue-glowing water is being spun around by nothing but sound waves. Reaching speeds up to 6,000 RPM, this centrifuge forms the basis for a new type of inexpensive, point-of-care biomedical test.

It’s tempting to think that the “plink” sound produced by a falling water droplet on a liquid surface is caused by the droplet itself, but new research points to an unexpected source of this familiar, ...