NAIROBI: (BBC): 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 middle 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. With this discovery, we are closing the gap on the evolutionary history of the human hand. ”