Mathematicians call the shape of a doughnut a 'toroid'. Physicists call a swirling fluid a 'vortex'. A toroidal vortex, then, is a swirling doughnut of fluid. This video from the Sleek Geeks archive ...

A demonstration of continuous sum-frequency generation of visible light in a microscopic silica resonator could provide a light source for on-chip silicon photonics and applications in the UV. The ...

The chemical interactions between suspended colloidal particles and a solute can induce the particles to self-propel, a phenomenon known as autophoresis. Studies of autophoretic motion have so far ...