Part the Fourth:
Number #1 Unappreciated Forcing (vulcanism - 2a) is the only known unknown that is inferable from the geologic record. The dog that doesn't bark, conspicuous by it's absence.
(Hope the mods don't listen all the way through, they might not be amused. Needs said though.)
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Three conspiracy theorists walk into a bar --You can't say that is a coincidence.
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