see strength of materialsstrength of materials, measurement in engineering of the capacity of metal, wood, concrete, and other materials to withstand stress and strain. Stress is the internal force exerted by one part of an elastic body upon the adjoining part, and strain is the deformation or change in. ..... Click the link for more information.
The Koreans are believed to have originated from ancient China. This is gathered from the archaeological and linguist evidence.
This is believed to be a village of a tribe that lived along the Daedong River. No one knows exactly where the Koreans came from or who they are. The humans as we know today, homo sapiens sapiens, came into being some two and half million years ago.