A hand axe (or handaxe or Acheulean hand axe) is a prehistoric stone tool with two faces that is the longest-used tool in human history. [1] . It is made from stone, usually flint or chert that has been "reduced" and shaped from a larger piece by knapping, or hitting against another stone.

In mathematics and physics, the right-hand rule is a convention and a mnemonic, utilized to define the orientation of axes in three-dimensional space and to determine the direction of the cross product of two vectors, as well as to establish the direction of the force on a current-carrying conductor in a magnetic field.

A hand axe (or handaxe or Acheulean hand axe) is a prehistoric stone tool with two faces that is the longest-used tool in human history. It is made from stone, usually flint or chert that has been "reduced" and shaped from a larger piece by knapping, or hitting against another stone.

Feb 27, 2009 · Long before humans painted caves or made colorful necklaces out of snail shells, they manufactured beautifully symmetrical, teardrop-shaped stone tools that archaeologists call hand axes, such as the ones shown at left from Atapuerca, Spain.

About 700,000 years ago a new Lower Paleolithic tool, the hand ax, appeared. The earliest European hand axes are assigned to the Abbevillian industry, which developed in northern France in the valley of the Somme River.

A hand axe is a stone tool of the Lower (early) and Middle Paleolithic Stone Age. It was bifacial, similar on both sides, and did not have a handle like a modern axe.

Areas of the human hand include: The palm (volar), which is the central region of the anterior part of the hand, located superficially to the metacarpus. The skin in this area contains dermal papillae to increase friction, such as are also present on the fingers and used for fingerprints.

Dec 5, 2016 · This chapter describes the basic anatomy of the bones, joints, and muscles of the hand—information essential to understanding impairments of the hand, as well as the treatments used to help restore its function following injury or disease.

Acheulean stone tools have been found over much of the Old World, from southern Africa to northern Europe and to the Indian sub-continent. Studies of surface-wear patterns reveal hand axes were used to butcher and skin game, dig in soil, and cut wood or other plant materials.

Nov 27, 2001 · During a period of immobilization, the resting lengths of the hand's ligaments and muscles change. This hand position provides the best balance of resting length and force production so the hand can function when the patient mobilizes it again.