Stone tools in the form of human hands
Human hands were shaped by the way our ancestors learned to make and use stone tools, a new study has found.
Tools Our ancestors passed basic rock beat axes chips together to make about 1.7 million years, the researchers said.
A new fossil belongs to the oldest anatomically modern hand suggests the strength and the skills necessary to make and use the latest tools in our hands quickly what they are today, ‘New Scientist’ reported.
A team led by Fredrick Kyalo Manthi of the National Museums of Kenya had discovered a bone intriguing in 2010. Carol Ward of the University of Missouri and colleagues identified him as a third metacarpal, the long bone in the palm of the hand between the middle finger and wrist.
As modern human metacarpals, has a small lump at the base – styloid. This projection helps stabilize the wrist when the hand is grasping small objects between the thumb and fingers.
Isotope dating revealed that the bone is about 1.4 billion years. They may have belonged to Homo erectus. Hand bones of early Homo erectus are almost unknown, said Richard Potts of the Smithsonian Institution in Washington DC.
“Having a well preserved specimen begins to respond to questions about the evolution of the hand,” he said. According to Mary Marzke of Arizona State University, which
shows that the hands of our ancestors were evolving in its modern form 1.4 million years ago.
Strong and repetitive processes and continuous use of tools, such as rock excavation, have become stronger hands desirable Marzke said.
The researchers said that this would have been particularly useful to knock flakes to upgrade and hand axes. Once the wrist important features were in place, it became easier for later hominids for small tools, thinner.
Ward Team believes it is the first evidence of anatomy evolving to adapt to new technology. As stone tools became more widespread, those with the structure of the wrists to use would have an evolutionary advantage. “The way we see today has been shaped by our behavior over millions of years,” said Ward.