Reactor at Earth's Core?

An anonymous submitter sent in this story suggesting that uranium in the Earth's core may be acting as a giant breeder reactor, generating a large amount of heat and perhaps being responsible for the Earth's magnetic field.

Comments

What's the rest made of?

[capt.Hij]

This is interesting stuff. I've always read that scientists thought that the core was made out of iron (Fe). If this new revelation is true then the density of the center of the core may be much higher than previously thought. What does that mean for the rest of the core? The density must be lower than previously thought???

Are we rewriting science history today?

[Caractacus Potts]

When did the Earth's magnetic field suddenly become such a "big mystery"?
Also, when did natural radioactive decay become a definition of a reactor?

Next thing ya know, we'll be discussing who invented the telephone!