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Earth's Mass Extinctions Follow a Strange 27-Million-Year Cycle — Scientists Finally Know Why
The fossil record shows a pulse: mass extinctions arrive like clockwork every 27 million years. The fossil record shows a pulse: mass extinctions arrive like clockwork every 27 million years. Every 27 million years, Earth experiences a catastrophic die-off — and it's happening on schedule. In 1984, paleontologists David Raup and Jack Sepkoski ...
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