[Rockhounds] 2-million year old stone balls hypothesized to have been used for marrow extraction

[Paul]

Mystery of 2 million-year-old stone balls solved
Here's how ancient cave dwellers used these stone balls.
By Laura Geggel, Live Science
https://www.livescience.com/ancient-stone-balls-bone-marrow.html

We May Finally Know Why Early Humans Kept
These Mysterious Stone Balls Around
Michelle Starr, Science Alert, April 17, 2020
https://www.sciencealert.com/archaeologists-may-have-figured-out-the-purpose-of-mysterious-prehistoric-stone-balls

The open access paper is:

Assaf, E., Caricola, I., Gopher, A., Rosell, J., Blasco, R.,
  Bar, O., Zilberman, E., Lemorini, C., Baena, J., Barkai,
R. and Cristiani, E., 2020. Shaped stone balls were
used for bone marrow extraction at Lower Paleolithic
Qesem Cave, Israel. Plos one, 15(4), p.e0230972.
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0230972
https://www.researchgate.net/publication/340546908_Shaped_stone_balls_were_used_for_bone_marrow_extraction_at_Lower_Paleolithic_Qesem_Cave_Israel
https://www.researchgate.net/profile/Cristina_Lemorini

Yours,

Paul H.