CALIFORNIA : Wealthier communities went from being the most mobile before the COVID-19 pandemic to the least mobile, while poorer areas have gone from the least-mobile to the most mobile, according to a study.The study by the University of California, Davis - showed about a 25 percentage point jump of the wealthiest census tracts staying completely at home compared with a 10 percentage point increase in staying at home in the poorest communities.The study, published today in the Proceedings of the National Academy of Sciences, used anonymised data from mobile device location pings between January and April 2020 to find that social distancing in the United States varies strongly by income."We found that before the pandemic, individuals in.