According to the article the inner core stopped spinning as it was and reversed direction in 2009
Hmmm. . .
I noticed that the water in my toilet suddenly started draining counterclockwise in 2009. I always thought itvhad something to do with Obama in the White House.
There’s a thing called visous damping. If you spin an uncooked egg it will spin less tha a hard boiled egg. I imagine for a solid core in a molten matrix it would be subject to damping forces if it reversed. where are these forces coming from?