Humans 40k yrs ago developed a system of conventional signs
Corroborated by 1 source from 1 publisher
globalgeneral3/4/2026
TL;DR
According to pnas.org, humans 40k yrs ago developed a system of conventional signs.
Corroborated by 1 source from 1 publisher
According to pnas.org, humans 40k yrs ago developed a system of conventional signs.