Ajit Pai @AjitPai
A "cosmic yo-yo": analysis of rock magnetism shows the Earth tilted ~12˚ on its side 84 million years ago and then "reversed course and rotated right back, for a total excursion of nearly 25˚ of arc in about five million years." https://t.co/phdJmxB1TE — PolitiTweet.org