The discovery of hand bone fossils of 140 million years of age suggests that the ability of modern humans to make and use complex tools may have originated much earlier than scientists had previously believed, the researchers said. One of the keys to the distinction between modern humans and all other living species is the ability to make complex tools. This is not only in the brains of very powerful people, but also in human hands, which gives this unique ability to human beings. On the contrary, humanoids, the relatives of humans' most intimate lives, lack the ability to grasp and create complex tools.
The key feature of modern human hands is the third metacarpal bone, which is the middle finger connected to the bone of the wrist. "There is a small projection on the third metacarpal called the styloid process, that is what we need to use the tool." Roller Ward, an anatomist and paleoanthropologist at the University of Missouri, said, "This tiny bit of bone The palm helps to lock the metacarpal bones to the wrist, helping the thumb and the palm of the hand to exert a greater amount of pressure on the thumb and other fingers. Its overall characteristics are complex, and this dexterity and strength also make it part of our ability to make and use complex tools." Until now, this styloid process has only been found in ancient humans such as modern humans and Neanderthals. Scientists cannot determine when this bone first appeared in the process of human evolution. (Human descendants, sage, first evolved into about 25,000 years ago in Africa.)
The hand bone fossils have a history of approximately 1.42 million years. The researchers suspect that it belongs to humans who are exterminating humans and is indisputably the earliest predecessor of modern humans. The researchers hope to find an older hand bone to verify when this functional evolution has occurred.
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