The Fire of Australia, a whacking great chunk of opal, isn't particularly interesting from a 'science' viewpoint.
But I'm human, which is probably why anything big and shiny gets my attention: including that rock.
Wrenching myself back on-topic, scientists found a stream of liquid metal flowing at the edge of Earth's core. Studying it may help us learn why Earth's magnetic field flip-flops at apparently-irregular intervals. What we'll learn is beyond me: we didn't know much about geomagnetic reversal when I started school.
We still don't, for that matter. As I keep saying, there is a very great deal left to learn.
More at A Catholic Citizen in America.