Conventional human signs 40,000 BP (opens in new tab)

"Humans 40,000 y Ago Developed a System of Conventional Signs." Bentz, Christian et al. Proceedings of the National Academy of Sciences 123, no. 9 (February 23, 2026): e2520385123. Painstaking research by Christian Benz, Ewa Dutkewicz, et al. Significance Humans have carved visual signs into the surfaces of mobile artifacts and cave walls since several hundred […]