Add Yahoo as a preferred source to see more of our stories on Google. A group of hikers look at one of the smoke rings A group of hikers look at one of the smoke rings Europe's most active volcano, ...

Content Starts in: Rare smoke ring display from Mount Etna Spectacular show of "volcanic vortex rings" seen by tourists in Italy. (Credit: ETNA WALK via AP) Tourists in Italy have been treated to ...

Add Yahoo as a preferred source to see more of our stories on Google. A team of researchers discovered an extraordinary property of vortex rings—how dolphins propel themselves underwater—that science ...

Mount Etna in Sicily, the largest active volcano in Europe, has been blowing spectacular “smoke rings” into the sky. The "volcanic vortex rings," a rare phenomenon that is generated by the combination ...

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 ...

Some scientists think we can better understand volcanoes by learning how the gaseous vortexes emerge. By Carolyn Wilke Some volcanoes perform a rather subtle trick: blowing rings of vapor that waft ...

Tourists in Italy have been treated to quite the show as Mount Etna, the largest active volcano in Europe, has been blowing spectacular “smoke rings” into the sky since last week. The rare phenomenon, ...

Some volcanoes perform a rather subtle trick: blowing rings of vapor that waft near their craters. The short-lived rings have been observed occasionally at volcanoes such as Etna in Italy and ...