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Ancient kauri trees capture last collapse of Earth’s magnetic field

Science | AAAS - Unleashed cosmic ray bombardment may have eaten up ozone, driving short-term climate
  • Blake wrote of seeing the world in a grain of sand. In the rings of an ancient New Zealand kauri tree, scientists got a window into our long-ago planet, when everything was turned upside down—at least magnetically speaking. https://t.co/0j9C0eePkY