ancient species

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How do they calculate a "million" years or more?

coffeebreak @coffeebreak (17797) • United States 21 Nov 07

I just dont get that. They find these fossils and say they are 390 million years old - a 8 foot scorpion was just found and dated that. http://news.yahoo.com/s/ap/20071121/ap_on_sc/biggest_bug_ever What constitutes one...

ancient species

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