Ancient swamp kauri tree rings have shed light on crucial changes to the Earth's atmosphere, which may have led to mass extinction of megafauna and the beginning of cave art. The Adams Event would have caused frequent and dazzling light shows in the sky - similar to the Northern and Southern Lights. Photo: 123RF Scientists from NIWA, the University of New South Wales Sydney (UNSW), the South Australian Museum, and the University of Waikato, have been working together on the study. They looked at what was happening just before the event known as the Laschamp Excursion - the last time when the...