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 huge cannon which shoots balls of fire does not sound the like safest thing to be playing with in your garden. But that is exactly what two keen scientist have made, using off-the-shelf materials.

Researchers have devised a method for producing toroid-shaped particles through a process called vortex ring freezing. The particles are mass produceable through inexpensive electrospraying. Some of ...