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Researchers used 3D modeling software to reconstruct ancient hands and then added the critical human thumb muscle to the model.

The Human Thumb Just Got 500,000 Years Older

Researchers studying the fossilized hands of 2-million-year-old hominins have concluded that human thumbs back then had the same movement ranges as our thumbs have today. It was the “dexterity” in...
A. Sebida hand bones show this human ancestor’s grip was similar to a modern human’s.       Source: Peter Schmid, courtesy of Tracy Kivell/University of Kent

2 Million-Year-Old Human Ancestor Had A Grip Just Like Us

Inhabiting what is now modern-day South Africa, an ancient human ancestor, Australopithecus sediba, that lived two million years ago had hands that might have enabled it to carry out some movements...