Core Rotates Faster than Crust

http://www.sciencedaily.com/releases/2005/08/050826081334.htm

Apparently, Earth's core rotates faster than the crust. From 1996, this had been a nine year debate ending in 2005. The proof was given by geologist Xiaodong Song, who presented the facts as to why the core's rotation is faster. Song and his team observed seventeen sets of similar seismic waves, called waveform doublets, from earthquakes that occurred near the coast of South America. The doublets allowed the scientists to find temporal changes along the paths of the samples. Although the inner core moves faster, the outer core does not move as fast because of it being mainly liquid, having less friction throughout the outer core.

I thought, again, that this article would be interesting. It was a little more intruiging than my last article, but I found that this one was just more confusing, so I didn't enjoy it very much. There was a section about 'differential rotation,' but I really didn't understand what that is. I don't really know what to write about my opinion, other than that I didn't particularly like this article, it wasn't very interesting. What I learned from it, though, was that the inner core moves faster than the crust, and because of that, we have a magnetic field. So, I'm kind of thankful that we have proved that the crust is slower than the core. This article was not very interesting at all, really.