Comet may have exploded over Canada 12,900 years ago after all

New evidence and support for a theory introduced in 2007 suggested a comet may have exploded over Canada 12,900 years ago (the Younger Dryas Boundary), killing off the Clovis people and large animals and sending the earth back into an ice age. It refutes a study in 2009 that failed to replicate the findings of the 2007 study. The key findings in this new study resulted from sampling done at an archaeological site known as Topper.

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