Around 150 AD, in the port city of Alexandria—then part of the Roman Empire—a man named Hero was tinkering with an unusual device.
He placed water inside a hollow metal sphere, lit a fire underneath it, and watched as steam burst from two angled nozzles on its surface.
The pressure caused the sphere to spin. No one had ever seen anything like it.
Image in the original: Aeolipile from Wikipedia
Today we’d call it a steam turbine.
It was, by all technical definitions, the world’s first steam engine.
And it changed nothing.
Hero’s invention was forgotten for nearly 1,700 years.
He didn’t build a locomotive.
No one started laying tracks through the empire. There was no Roman industrial revolution.
Why?
Because no one needed it.
At the time, the Roman world had plenty of cheap labor.
Enslaved people powered the economy.
Why build machines when humans were so abundant, obedient, and cost-effective?
Hero’s steam engine wasn’t used because the society around it wasn’t looking for one.
The technology existed—but the motivation to apply it did not.
This disconnect wasn’t an isolated case.
It happened within the walls of the greatest intellectual project of the ancient world: the Library of Alexandria.
Founded in the 3rd century BC, the Library aimed to collect all the world’s knowledge.
Its curators seized books from arriving ships, copied them, and archived the originals.
They translated between languages, debated ideas, and documented everything from astronomy to anatomy.
You could call it the internet of its time—except centralized, physical, and vulnerable.
And vulnerable it was.
The Library didn’t vanish in a single fire, as some legends say.
It was neglected, fought over, and eroded over time.
Some of its collections may have burned during Julius Caesar’s campaign in 48 BC.
Others were destroyed when the Christian Roman Empire began dismantling “pagan” sites in the 4th century.
Later accounts blame the Arab conquest in the 7th century, but the real cause was more mundane: no one protected it. The flame of knowledge died not with a bang, but with a shrug.
But let’s imagine a different outcome.
What if Hero’s engine had sparked real interest?
What if someone saw its potential—not as a toy, but as a tool?
The Roman Empire had roads, infrastructure, metallurgy, engineers. It wasn’t missing prerequisites. It was missing urgency.
Had steam power taken off in the second century, the industrial revolution might have happened over a millennium earlier.
The Renaissance, the Enlightenment, the space race—possibly all of it would have been moved forward by hundreds of years.
AI might not be something we’re just discovering now.
We might already be generations into it.
And yet, would that have been a good thing?
There’s another side to this fantasy.
If humans had unlocked industrial energy a thousand years earlier, we might have burned through Earth’s resources long ago.
Climate change, war, inequality—these problems didn’t begin with technology, but they often accelerated with it.
Faster progress doesn’t always mean wiser outcomes.
Sometimes, what saves us is that we’re late.
Which brings us to today.
We’re surrounded by technologies that could change everything: artificial intelligence, biotechnology, clean energy.
Some are being commercialized quickly; others, ignored completely.
Many are filtered through short-term metrics: Can we monetize this? How quickly? What’s the ROI?
That same mindset—“Is this useful right now?”—was what left Hero’s invention to collect dust.
Invention isn’t enough.
The world has to be ready—or willing—to see its value.
That’s what makes stories like Hero’s so haunting.
They remind us that progress isn’t inevitable.
Sometimes, the tools are there, but no one sees the point of using them.
Not because they’re wrong. Just because they arrived before their time.
We like to imagine that history moves forward on its own. It doesn’t. It hesitates. It forgets.
And sometimes, it walks right past something that could have changed everything.
That’s worth remembering—not just when we look back, but when we look around. ■
First published on Substack on Apr 30, 2025 (JST). Archived here as part of the Fabio Caipirinha permanent archive (published on this site: Oct 15, 2026). Images from the original are omitted here pending rights clearance. Original: https://fabiocaipirinha.substack.com/p/the-steam-engine-that-didnt-turn
Cover image: Illustration of Hero of Alexandria’s aeolipile (CC BY 4.0, Wikimedia Commons — source)
