Ancient wall in Morocco; Mexican rock art depicts the underworld; much greater Indigenous Australian population estimate; lead-based method to unlock Herculaneum scrolls

Ancient wall points to early defensive engineering in Morocco [Alternate Link]

Dozens of ancient Mexican rock paintings trace a journey to the underworld

Pre-colonization, Indigenous Australian population may have been as high as 2.2 million

Researchers try lead-based method that could unlock the Herculaneum scrolls [Alternate Link]