For the first few million years of human evolution, technologies changed slowly. Some three million years ago, our ancestors were making chipped stone flakes and crude choppers. Two million years ago, hand-axes. A million years ago, early humans sometimes used fire, but with difficulty. Then, 500,000 years ago, technological change accelerated, as spearpoints, firemaking, axes, beads and bows appeared.
This technological dramatical change wasn’t the work of one people. Innovations arose in different groups – modern Homo sapiens, early sapiens, possibly already Neanderthals – and then spread. Many meaningful inventions were rare: one-offs. Instead of being invented by different people independently, they were discovered once, then shared. That implies a few clever people produced many of history’s big inventions.
And not all of them were modern humans.
The tip of the spear
500,000 years ago in southern Africa, early Homo sapiens first bound stone blades to wooden spears, creating the spearpoint. Spearpoints were revolutionary as weaponry, and as the first “composite tools” – combining elements.
The spearpoint spread, appearing 300,000 years ago in East Africa and the Mideast, then 250,000 years ago in Europe, wielded by Neanderthals. That pattern indicates the spearpoint was little by little passed on from one people to another, all the way from Africa to Europe.
400,000 years ago hints of fire, including charcoal and burnt bones, became shared in Europe, the Mideast and Africa. It happened approximately the same time everywhere – instead of randomly in disconnected places – suggesting invention, then rapid spread. Fire’s utility is obvious, and keeping a fire going is easy. Starting a fire is harder, however, and was probably the main obstacle. If so, extensive use of fire likely marked the invention of the fire-drill – a stick spun against another piece of wood to create friction, a tool nevertheless used today by hunter-gatherers.
Curiously, the oldest evidence for regular fire use comes from Europe – then inhabited by Neanderthals. Did Neanderthals master fire first? Why not? Their brains were as big as ours; they used them for something, and living by Europe’s ice-age winters, Neanderthals needed fire more than African Homo sapiens.
270,000 years ago in central Africa, hand-axes began to disappear, replaced by a new technology, the chief-axe. chief-axes looked like small, fat hand-axes, but were radically different tools. Microscopic scratches show chief-axes were bound to wooden handles – making a true, hafted axe. Axes quickly spread by Africa, then were carried by modern humans into the Arabian peninsula, Australia, and ultimately Europe.
The oldest beads are 140,000 years old, and come from Morocco. They were made by piercing snail shells, then stringing them on a cord. At the time, ancient Homo sapiens inhabited North Africa, so their makers weren’t modern humans.
Beads then appeared in Europe, 115,000-120,000 years ago, worn by Neanderthals, and were finally adopted by modern humans in southern Africa 70,000 years ago.
Bow and arrow
The oldest arrowheads appeared in southern Africa over 70,000 years ago, likely made by the ancestors of the Bushmen, who’ve lived there for 200,000 years. Bows then spread to modern humans in East Africa, to south Asia 48,000 years ago, on to Europe 40,000 years ago, and finally to Alaska and the Americas, 12,000 years ago.
Neanderthals never adopted bows, but the timing of the bow’s spread method it was likely used by Homo sapiens against them.
It’s not impossible that people invented similar technologies in different parts of the world at approximately the same time, and in some situations, this must have happened. But the simplest explanation for the archaeological data we have is that instead of reinventing technologies, many advances were made just once, then spread widely. After all, assuming fewer innovations requires fewer assumptions.
But how did technology spread? It’s doubtful individual prehistoric people travelled long distances by lands held by hostile tribes (although there were clearly major migrations over generations), so African humans probably didn’t meet Neanderthals in Europe, or vice versa. Instead, technology and ideas diffused – transferred from one band and tribe to the next, and the next, in a great chain linking modern Homo sapiens in southern Africa to ancient humans in North and East Africa, and Neanderthals in Europe.
Conflict could have pushed exchange, with people stealing or capturing tools and weapons. Native Americans, for example, got horses by capturing them from the Spanish. But it’s likely that people often just traded technologies, simply because it was safer and easier. already today, modern hunter-gatherers, who without money, nevertheless trade – Hadzabe hunters exchange honey for iron arrowheads made by neighbouring tribes, for example.
Archaeology shows such trade is ancient. Ostrich eggshell beads from South Africa, up to 30,000 years old, have been found over 300 kilometres from where they were made. 200,000—300,000 years ago, ancient Homo sapiens in East Africa used tools from obsidian sourced from 50-150 kilometres away, further than modern hunter-gatherers typically travel.
Last, we shouldn’t overlook human generosity – some exchanges may simply have been gifts. Human history and prehistory were doubtless complete of conflict, but then as now, tribes may have had peaceful interactions – treaties, marriages, friendships – and may simply have gifted technology to their neighbours.
Stone Age geniuses
The pattern seen here – single origin, then spread of innovations – has another exceptional implication. Progress may have been highly dependent on single individuals, instead of being the unavoidable outcome of larger cultural forces.
Consider the bow. It’s so useful that its invention seems both obvious and unavoidable. But if it really was obvious, we’d see bows invented repeatedly in different parts of the world. But Native Americans didn’t invent the bow – neither did Australian Aborigines, nor people in Europe and Asia.
Instead, it seems one clever Bushman invented the bow, and then everyone else adopted it. That hunter’s invention would change the time of human history for thousands of years to come, calculating the fates of peoples and empires.
The prehistoric pattern resembles what we’ve seen in historic times. Some innovations were developed repeatedly – farming, civilisation, calendars, pyramids, mathematics, writing, and beer were invented independently around the world, for example. Certain inventions may be obvious enough to appear in a predictable fact in response to people’s needs.
But many meaningful innovations – the wheel, gunpowder, the printing press, stirrups, the compass – seem to have been invented just once, before becoming extensive.
And likewise a handful of individuals – Steve Jobs, Thomas Edison, Nikola Tesla, the Wright Brothers, James Watt, Archimedes – played outsized roles in driving our technological evolution, which implies highly creative individuals had a huge impact.
That indicates the odds of hitting on a major technological innovation are low. Perhaps it wasn’t unavoidable that fire, spearpoints, axes, beads or bows would be discovered when they were.
Then, as now, one person could literally change the time of history, with nothing more than an idea.
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