7 million years, in one descent
Deep-Time Timeline
The making began before us and accelerates after us. Read top to bottom: from the first hominins to the transistor, the same impulse compounding.
The Hominin Lineage Begins
Sahelanthropus tchadensis, discovered in Chad, marks the approximate divergence of the human lineage from other great apes — the ancestral stock from which all technology will eventually flow.
The Acheulean Hand-Axe
Homo erectus produced the teardrop-shaped hand-axe across Africa and Eurasia — the first tool shaped to a mental template, revealing that toolmaking had become a cognitive act.
Homo sapiens Emerges
Fossils from Jebel Irhoud in Morocco push back the origin of anatomically modern humans, situating our species within a mosaic of African populations already experimenting with composite tools.
Upper Paleolithic Explosion
Cave paintings at Chauvet and Sulawesi, bone flutes, the bow, eyed needles, and long-distance trade networks mark a sudden flowering of technical and expressive complexity that reshapes every subsequent era.
The Urban Revolution
Uruk grew to perhaps 80,000 inhabitants by 3200 BCE, assembling the first dense urban infrastructure — temples, granaries, craft workshops, and bureaucracies — that made organized technological specialization possible at scale.
The Iron Age Begins
The collapse of Bronze Age palace economies around 1200 BCE disrupted tin supplies, forcing smiths across the eastern Mediterranean to master iron smelting — a harder, more abundant metal that democratized weaponry and agriculture.
Gutenberg's Movable Type
Johannes Gutenberg's oil-based ink and cast-metal type in Mainz made books reproducible at industrial scale, collapsing the cost of transmitting knowledge and inaugurating the information economy five centuries before the internet.
Watt's Steam Engine
James Watt's separate condenser dramatically improved the efficiency of Newcomen's atmospheric engine, making mechanical power portable and scalable — the prime mover of the Industrial Revolution and the first global energy transition.
The Electronic Computer
ENIAC, completed at the University of Pennsylvania in 1945, demonstrated that logical operations could be performed at electronic speeds — establishing computation as a general-purpose technology rather than a specialized calculator.
The Transistor at Bell Labs
Shockley, Bardeen, and Brattain's point-contact transistor replaced the vacuum tube with a solid-state switch, enabling the miniaturization cascade that would produce microprocessors, smartphones, and eventually AI.
Technology Accelerates — The Question Becomes Urgent
As AI systems begin to design tools beyond human comprehension, the 3.3-million-year arc from Lomekwi flint-knapper to large language model demands examination: what technology is, where it came from, and where it is taking us.