Katherine Reece Wrote:
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> I found this video on youtube. Very cool!
>
> [www.youtube.com]

Yep, those are the bad guys!

However, there is still a problem. One object shown in the Nature paper (page 5 Fig. 3:I) can't be made by the monkey 'hammer and anvil' method. It is either hominin made or a geofact because it had to have been made by a multi-step process. The monkey tools don't show anything that can't be made with just one hit. If you will notice, Fig. 3:I resembles a gun flint like those made for flintlock rifles. Examples of the gun flint type (called bend-break) and have been found at the Calico Early Man Site in California and at Topper in South Carolina. The pre-Clovis layers at both of those sites have been heavily criticized, so there is no reason why the Chiquihuite Cave rocks won't suffer the same fate.
Personally, I think it will just be a matter of time before some of the better flintknapper/archaeologists like Metin Eren, Loren Davis, or Jesse Tune etc. write a rebuttal in a peer-reviewed journal.

References
Ardelean, C.F., Becerra-Valdivia, L., Pedersen, M.W. et al. Evidence of human occupation in Mexico around the Last Glacial Maximum. Nature (2020). [doi.org]
[www.kent.edu]
[www.fortlewis.edu]