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ET Impact Probably Didn’t Wipe Out Clovis
In a paper published in PNAS in 2007 ((Firestone RB, et al. (2007) Evidence for an extraterrestrial impact 12,900 years ago that contributed to the […]
In a paper published in PNAS in 2007 ((Firestone RB, et al. (2007) Evidence for an extraterrestrial impact 12,900 years ago that contributed to the […]
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