I don't know why I've been looking up extinction. Maybe it's the several days worth of Battlestar Galactica (which is fabulous, by the way). Anyway, there are five mass extinctions: O/S, End-D, P/T, Tr/J, and K/T. K/T (Cretaceous/Tertiary) extinction is the dinosaur one - the one everyone remembers. However, P/T (Permian/Triassic) is the Great
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