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"Researchers believe ice discs spin because of temperature changes in the water, creating a vortex underneath."
F'wits! Have they not heard of an eddy?
“Big whirls have little whirls, That feed on their velocity; And little whirls have lesser whirls, And so on to viscosity.”
Didn't we the interwebz go crazy over this kind of thing last year, or the year before. Didn't some people organize a party or a picnic on one? Proving difficult to search it whatever it was.
"researchers believe" = "I just made this up after 5 seconds thought, and without watching the video, or any river ever"
It's amazing !!!!!!!!!!!!!!!!!!!
Lawks.
What about the astonishing revelation on the BBC video further down that page?
"Ice pancakes are usually found in colder climates"
I thought it was supported by 4 mammoths on the back of a turtle....or something like that...
It's a good job circles aren't omnipresent in nature, or we'd be overwhelmed with shock horror news like this.