Science·phys.org↗·1dPolar vortex faltering weeks earlier than ever recorded#Science#phys.orgSourceRead the original at phys.org0SaveShare📚Add to CollectionNext postPakistani astronaut to board Shenzhou 24 and become the first foreigner on China's space stationRelated postsWhy the tropics lose the most birds when cities expandphys.orgPersonalized savings reminders can help boost retirement savingsphys.orgStudent finds proof of rare wild cat in northern New Mexicophys.org