New research points to fragments of a comet exploding over North America approximately 13,000 years ago, sparking firestorms and rapid cooling that could have contributed to the extinction of mammoths. Scientists report finding telltale “shocked” quartz grains at classic Clovis sites dating to the Younger Dryas boundary, evidence of intense heat and pressure. This suggests a cosmic airburst triggered widespread fires and an “impact winter,” stressing Ice Age ecosystems and life.
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