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Rock 'face' mystery baffles experts

Archaeologists have found three unusual markings carved into rocks near Rothbury, Northumberland, including a small heart shape and a stylised human face. The origin and meaning of these marks remain unknown, with experts speculating they could be as young as 100-250 years old.

Artifact analyses dispute assumptions about a prehistoric society

Researchers at University of Illinois dispute extensive trade theory for prehistoric society Cahokia, citing new evidence that local red flint clay was used instead of catlinite. The study uses a new mineral analyzer technique to identify the stone's mineral composition and find no connection between catlinite and the culture.