Hand axe

A hand axe is a prehistoric stone tool with two faces. It is the longest-used tool in human history. These tools are characteristic of the lower Acheulean and middle Palaeolithic periods. This time lasted from roughly 1.6 million years ago to about 100,000 years ago.

Early humans like Homo erectus used them frequently. However, they were rarely used by Homo sapiens. Scientists often call these tools bifaces. This technical term means the tool has two wide sides or faces. Many hand axes are also described as amygdaloid, which means they have an almond shape.

Making a hand axe requires a process called knapping. This involves hitting a stone against another stone to shape it. Makers usually chose stones like flint or chert. Other materials included rhyolites, phonolites, and quartzites.

Obsidian is a natural volcanic glass, but it was rarely used because it shatters too easily. During knapping, the maker removes the natural outer layer, called the cortex. This can be done through percussion or pressure. The goal is often to create a symmetrical tool along its longitudinal axis. This process transforms a large piece of stone into a functional object.

Researchers categorize hand axes into four distinct classes. The first class includes large, thick hand axes called blanks. These are reduced from large cores or thick flakes. The second class consists of thinned blanks. In these, the maker has tried to reduce the thickness of the core. The third class includes preforms or crude formalized tools, such as an adze.

The fourth class contains finer formalized tool types. These include projectile points and fine bifaces. While some scholars use different divisions, these classes help explain the stages of tool production. Even a piece that is not a finished tool can be part of this lithic reduction sequence.

History shows that people did not always understand these objects. For a long time, people thought they were natural or supernatural. They were often called thunderstones. Many believed they fell from the sky during storms. Others thought lightning formed them inside the earth.

The first published representation of a hand axe appeared in 1800. It was drawn by John Frere for a British publication. This discovery helped scientists recognize them as prehistoric tools. In some rural areas, people still use these stones as amulets to protect against storms. This shows how deeply these objects are rooted in human tradition.

There are many theories regarding how these tools were actually used. Most researchers believe they were primarily cutting tools. They were likely used for tasks like animal butchery. The wide base provided an ergonomic area for a hand to grip.

Some scholars suggested they were used as throwing weapons. One theory proposed they were "killer frisbees" used to stun animals at water holes. However, many experts find this theory poorly conceived. Other researchers suggest they were multi-functional. They might have been used for digging, scraping, chopping, piercing, or even hammering. Because they can be resharpened, they were very versatile.

Some hand axes show incredible skill that goes beyond simple survival. Some pieces are "overdetermined," meaning they have symmetry beyond what is needed for work. Some were even made of bone instead of stone.

This suggests they may have had ritual or social uses. Some scientists believe they were used for sexual selection. In this theory, a symmetrical hand axe acted as a fitness indicator. It showed that the maker had patience, strength, and coordination. This would make the maker a more attractive mate. Other examples include very large tools, like one found in England that was 30.6 centimeters long.

Hand axes connect us to the earliest human technologies. They represent a major step in how humans planned and shaped their environment. Even though they are ancient, they appear in many different prehistoric epochs worldwide. They are not limited to the Old World or a single time period. For example, similar tools were used to clear vegetation during the Neolithic and Chalochithic periods. In New Guinea, people along the Sepik River still use tools that are virtually identical to hand axes. Studying these stones helps us understand the long history of human innovation.