Shaped stone balls were used for bone marrow extraction at Lower Paleolithic Qesem Cave, Israel - Assaf, Ella; Caricola, Isabella; Gopher, Avi; Rosell, Jordi; Blasco, Ruth; Bar, Oded; Zilberman, Ezra; Lemorini, Cristina; Baena Preysler, Javier; Barkai, Ran; Cristiani, Emanuela (2020)