The CNN article I just skimmed about this has a very interesting science communication issue. It notes that originally the solid inner core rotated faster than the rest of the planet, but that in 2010 it rotated slower than the rest of the planet. It's not clear from CNN's article:<p>1. Whether the inner core was or was not observed to spin faster than the rest of the planet
2. Whether the inner core changed (relative?) speed in 2010 or whether its behavior was confirmed in 2010, or
3. Perhaps most interestingly, whether the inner core had spun faster than the rest of the planet and we happened to be alive at the time when, for the first time in our planet's 4.6 billion year history, that changed in 2010, or whether they swap rotation rates now and then.<p>This is not really criticism. Science communication is hard. Hell, I've probably misrepresented CNN's representation 2-3 times in this comment.