Looked over their evidence details [https://www.pnas.org/content/pnas/suppl/2021/09/30/2108236118.DCSupplemental/pnas.2108236118.sapp.pdf https://www.pnas.org/c

Looked over their evidence details [https://www.pnas.org/content/pnas/suppl/2021/09/30/2108236118.DCSupplemental/pnas.2108236118.sapp.pdf https://www.pnas.org/content/pnas/suppl/2021/09/30/210823611...]. Looks somewhat circumstancial. Hopefully it's enough to stimulate further search for something more substantial. Going by our national parks, if people stayed for a while, it's there.