Arrgh! Yet Another Flip-Flopper

First Bush accuses Kerry of flip-flopping.  Then Kerry accuses Bush of flip-flopping.  Now we learn that the ENTIRE PLANET is flip-flopping.  This from Scientific American:  Magnetic Field Flip-Flop Clocked: The earth's magnetic field is in constant flux, and undergoes a complete reversal in polarity at irregular intervals every several hundred thousand years or so. That much has been known for some time. But scientists have so far been unable to pin down why polarity reversals occur and how long they take. [...] --Alla Katsnelson