HFU HF Underground

General Category => Huh? => Topic started by: MDK2 on February 20, 2021, 2105 UTC

Title: Ancient Trees Show When The Earth's Magnetic Field Last Flipped Out
Post by: MDK2 on February 20, 2021, 2105 UTC

https://www.npr.org/2021/02/18/969063568/ancient-trees-show-when-the-earths-magnetic-field-last-flipped-out