Hand axe
A hand axe is a prehistoric stone tool with two faces that is the longest-used tool in human history. It is usually composed of flint or chert. It is characteristic of the lower Acheulean and middle Palaeolithic (Mousterian) periods. Its technical name (biface) comes from the fact that the archetypical model is a generally bifacial Lithic flake with an almond-shaped (amygdaloidal) morphology. Hand axes tend to be symmetrical along their longitudinal axis and formed by pressure or percussion. The most common hand axes have a pointed end and rounded base, which gives them their characteristic shape, and both faces have been knapped to remove the natural cortex, at least partially. Hand axes are a type of the somewhat wider biface group of two-faced tools or weapons.
Hand axes were the first prehistoric tools to be recognized as such: the first published representation of a hand axe was drawn by John Frere and appeared in a British publication in 1800. Up until that time their origins were thought to be natural or supernatural (they were called «Thunderstones» because popular tradition held that they had fallen from the sky during storms or were formed inside the earth by a lightning strike and then appeared at the surface; in fact they are still used in some rural areas as an amulet to protect against storms).