Time series of O2 (blue) and VGADM (red). (Credit: Weijia Kuang, Science Advances, 2025) In an Earth-sized take on the age-old ‘correlation or causality’ question, researchers have come across a fascinating match between Earth’s magnetic field and its oxygen levels since the Cambrian explosion, about 500 million years ago. The full results by [Weijia Kuang] […]