Butchered bones hint humans were in South America 21,000 years ago

Marks found on the 21,000-year-old bones of a giant, armadillo-like animal in Argentina may be the oldest evidence of humans in the southern South America.

If confirmed through additional excavation and research, the findings could push back the date humans were known to be living in the area by about five millennia, to the end of the last glacial period. That…