I wonder how Salmon can use the magnetic field to define the ranges of their habitat (as an ancient species... like 10s of millions of years old) considering the magnetic field is not all that constant.
http://en.wikipedia.org/wiki/Geomagnetic…
an excursion does not permanently change the large-scale orientation of the field, but rather represents a dramatic, typically short-lived decrease in field intensity, with a variation in pole orientation of up to 45 degrees from the previous position. These events, which typically last a few thousand to a few tens of thousands of years, often involve declines in field strength to between 0 and 20% of normal. Excursions, unlike reversals, are generally not recorded across the entire globe.
@3) The difference between Geologic time (on the order of 10,000 years) v. Ecologic time (on the order of 100 years). Maybe the changes in the Geomag field are slow and gradual enough that the salmon can "update their maps," as it were.
About the zombie thing.... What would happen if someone totally freaked out and started stomping on the actors' hands? Or had a gun and started shooting?
@7 I think one of the problems we have in much of our discourse is that we seem to have lost the ability to discuss matters of degree.
Clearly, all child rape is horrific, and so we can not reasonably distinguish between the forcible rape of a seven-year-old and the statutory rape of a seventeen-year-old or any permutations thereof.
You mean his entire 22 year run? (rim shot)
Team Coco forever!
http://en.wikipedia.org/wiki/Geomagnetic…
an excursion does not permanently change the large-scale orientation of the field, but rather represents a dramatic, typically short-lived decrease in field intensity, with a variation in pole orientation of up to 45 degrees from the previous position. These events, which typically last a few thousand to a few tens of thousands of years, often involve declines in field strength to between 0 and 20% of normal. Excursions, unlike reversals, are generally not recorded across the entire globe.
Seriously, the marketers just aren't that bright.
Clearly, all child rape is horrific, and so we can not reasonably distinguish between the forcible rape of a seven-year-old and the statutory rape of a seventeen-year-old or any permutations thereof.