Take a trip to southwest France for a theme park like no other, says Esther Halligan, who took her 11-year-old son Otto to ...

Scientists observed and reported how vortex rings, swirling donut-shaped masses, move through water and reach air without ...

Air rings blown by dolphins swimming underwater and rings of smoke emitted by jet engines are just two examples of vortex rings. These doughnut-shaped structures and their mesmerizing movement have ...