Ancient hand bone dates origins of human dexterity

The styloid process allows the hand to lock into the wrist bones

The discovery of an ancient bone at a burial site in Kenya puts the origin of human hand dexterity more than half a million years earlier than previously thought.

In all ways, the bone - a well-preserved metacarpal that connects to the index finger - resembles that of modern man, PNAS journal reports.

It is the earliest fossilised evidence of when humans developed a strong enough grip to start using tools.

Apes lack the same anatomical features.

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