A bit of leg bone from an Aratasaurus dinosaur fossil collected in Brazil has preserved abundant 3D red blood cells in stunning detail https://www.newscientist.com/article/2596881-dinosaur-red-blood-cells-recovered-from-115-million-year-old-fossil/?utm_term=Autofeed&utm_campaign=echobox&utm_medium=social&utm_source=Twitter#Echobox=1793649898