From the University of South Carolina – PNAS: Topper site in middle of comet controversy By Peggy Binette, USC Did a massive comet explode over Canada 12,900 years ago, wiping…
From the University of South Carolina – PNAS: Topper site in middle of comet controversy By Peggy Binette, USC Did a massive comet explode over Canada 12,900 years ago, wiping…
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