The Anatomy of Uncertainty and Risk:

From Sumerian Mythology to the Present Day

 

PART ONE, The Ancient Face of Uncertainty: Sumer

"Fate in Sumerian Mythology: The Limits of Divine Decree and Humanity"

1. Writing

Sumerian cuneiform was born around 3400–3200 BCE in Uruk. It most likely emerged from the needs of the temple and palace economy, to record quantities of grain, numbers of sheep, and who owed what to whom. The vast majority of the earliest written documents probably began this way: as accounting records, not as poetry, hymns, or mythological tales.

When we invented writing, what we first tried to say was not a story or a prayer. It's strange to think that the first thing we wrote was about keeping accounts: this much is mine, this much is yours, the quantity is such-and-such. When we set aside the legends and myths we associate with Sumerian history, this is what remains.

Of course, not everything was written simply to record what already existed, the real point was to fix future uncertainties before they could arise, to resolve potential disputes before they emerged. In this sense, writing was a tool developed against the erosive effects of time.

When the Sumerians did this, a mythological world stretched around them from the sky to the earth to the underworld. The gods ruled over everything; they determined the future. And yet the merchant or temple scribe bent over their tablet, carving out debts, credits, and contracts.

 

2. Divine Hierarchy and Mythology

2.1. An, Enlil, Enki

At the very top of the Sumerian divine hierarchy stood An (Akkadian: Anu). As the first mover of the heavens, in Platonic or Aristotelian terms, he occupied the most transcendent tier of divine order. Yet despite this elevated position, the true master of everyday workings and order was Enlil. Enlil was, in short, the executive. As the god of wind and air, his decisions carried an irrevocable sovereignty; it was unthinkable for other gods to challenge him. Beside Enlil stood Enki, the god of fresh waters, wisdom, and intelligence, that ancient figure who represented flexibility and creativity within the rigid lines of order.

At the center of all this hierarchy stood the Tablet of Destinies (Sumerian: dub namtarra), the embodiment of the authority to determine fate. No text says exactly what was written on the tablet, because what mattered was not its content but its very existence. Whoever carried it held absolute sovereignty over destiny. But being made physical in this way also meant it could be stolen.

In the Legend of Anzu, that enormous silhouette, half lion and half eagle (the Sumerians called it Imdugud), which once gathered its courage and snatched the reins of fate from Enlil's hands, the universe experienced something like brain death. Rivers stopped flowing, the earth grew sullen, the gods' thunderous voices sank into deep silence. Because when the Tablet of Destinies was stolen, order itself, fate itself, had been suspended. Until Enlil's son Ninurta appeared and brought this ancient thief to heel, the world held its breath and waited. When the tablet was returned, life began to flow again from where it had left off, as if it had never stopped.

The Sumerians had not left uncertainty abstract, they had transformed it into something tangible, something you could hold in your hands.

 

2.2. Namtar

Among Enlil's children, there is one we cannot pass over without mention: Namtar. In Sumerian, the name directly means 'fate' or 'destiny.' But Namtar is not the abstract concept we might imagine, it is a personified, tangible being that keeps walking until it arrives at your door. When we say in everyday speech 'evil has found us,' the ancient hand that seeks and finds, that never misses its mark, that is precisely Namtar itself. Namtar is fate knocking at the door, and the Anunnaki are the assembly that stamps its seal beneath that fate.

Namtar was the messenger of Ereshkigal, the goddess of the underworld. It was Namtar who brought disease and death into the world. In Sumerian poetry, illness is sometimes referred to as 'the hand of Namtar.' The healing goddess Ninisina is summoned in ritual texts specifically against Namtar, meaning the oldest form of medicine was born from within this very conflict.

There were no temples built for Namtar, no statues erected, and almost no prayers directed at it, until someone arrived at the threshold of death. In the deathbed narrative of Gilgamesh, and in the funeral poem of Ur-Namma, offerings to Namtar are mentioned. He was turned to only at the very last moment, when no other option remained.

When you think about it, this is a very familiar psychology. To postpone confronting the inevitable for as long as possible, to keep it outside the bounds of daily life, to build no temple for it. But turning one's back on that door does not mean the door does not exist.

 

2.3. Enki: If Fate Is Inevitable, What Can We Do?

Enlil set the rules. Namtar executed the final verdict. Enki, between the two, searched for a gap, an opening within the system.

In the Atrahasis Epic, Enlil can no longer bear the noise humanity makes. He sends plague first, then famine, then the flood. Each time, it is Enki who saves humanity, not by directly opposing Enlil, but by finding ways around him. When the plague comes, he tells people to direct all their offerings to the single god responsible for the plague, that is, to Namtar. That god is overwhelmed with gifts, grows ashamed, and withdraws the plague. They survive the famine by a similar method. When it comes to the flood, Enki whispers to Ziusudra, the Sumerian version of Noah, in a dream: Build a ship. Enki does not directly defy Enlil's command, but finds within that command an opening through which life can continue.

This narrative pattern says something very modern: You cannot reduce risk to zero, but you can redirect it. You cannot change the shape of fate, but you can choose how to respond to it. Every intervention by Enki is precisely the exercise of this choice. In modern language we call this 'risk management'; in the Sumerian experience, it was called 'Enki's whisper.'

 

3. Evil

3.1. Evil Was Also Part of the System

From today's perspective, one of the strangest concepts in Sumerian mythology is 'Me', the totality of divine decrees that sustain the workings of civilization. It had more than a hundred entries: kingship, priesthood, wisdom, music, lamentation, crafts, victory... Up to this point, the concepts feel close to our own. But the list also contains surprising items: the destruction of cities, lies, enmity. The Sumerians had not kept evil outside the system, they had taken it inside. These, too, were decrees to be accepted, not questioned. The Sumerians had domesticated negative situations by embedding them within the system rather than pushing them to its margins. For them, risk and evil were not malfunctions but operating principles of the universe.

Enki was the guardian of the 'Me.' The goddess of love and war, Inanna, steals them. According to the legend, Inanna visits Enki and they drink together. Enki becomes generous and offers the Me one by one as gifts. Inanna loads them onto her boat and sets out toward her city, Uruk. By the time Enki sobers up, it is too late. Fate and decrees were not fixed, they could be negotiated, even stolen. They contained both good and evil within them. Risk was not a malfunction outside the system; it was part of the system itself.

(Note: Let us not confuse the Me with the Tablet of Destinies. While the Tablet of Destinies is a single object determining cosmic fate and the ultimate authority of the gods, the Me are plural and encompass both the creative and destructive rules of civilization. Both are embodied powers, but they play different roles.)

These 'Me', the divine operating system of civilization, might have been carried in celestial boats and passed between gods, but they found their true echo in the dusty streets of the earth. As Gönül Tekin said in a program: what exists in the sky also exists on earth. (We will later encounter this approach in Greece as a Platonic perspective.) The abstract tablets of destruction or wisdom that Inanna brought to Uruk were not mere legends for a mortal Sumerian, they were the backdrop of very concrete life struggles: a ship sinking, a harvest failing, an inability to repay a debt. As this cosmic gamble among the gods merged with humanity's daily struggle for survival, the metaphysical began to yield its place to mathematics. While the great and heavy tablet of fate hung suspended in the heavens, the Sumerian man would take another tool into his own hands to manage his small, personal fate, tablets of clay, wet and ready for him to carve his own signature.

 

PART TWO, Practical Tools of Risk

4. Reading the Liver of the Sky

For the Sumerians, managing uncertainty was not merely a matter of scratching figures and writing into clay. They believed the universe was a vast 'writing tablet,' and that the gods left their decisions about the future as coded messages in every corner of this tablet. Divination for them was not 'predicting the future' but 'reading the codes the god has written into the universe.' At this point, professional diviner-priests, the Baru class, entered the scene, working much like today's risk analysts.

The Baru priests carried out a highly technical and observation-based reading. Before a caravan set out or a strategic move was made, they used the following methods as decision-support tools:

One method was Liver Divination: They examined the contours of the liver of a sacrificed sheep. The liver was where the god had written its current intentions. A spot on the liver was read as a 'bug' in the system or an approaching 'crisis' signal, and the operation was halted. 'If there are two furrows on the right side of the liver, the enemy army will attack the kingdom from two directions.' These texts show that the Baru priests were not making arbitrary interpretations but acting on records and experience accumulated over thousands of years. Another method was Oil and Water Divination: They poured water into a vessel, dripped oil on it, and analyzed future possibilities by observing the shapes the oil formed on the water.

Unlike the Oracle of Delphi in Ancient Greece, which was perhaps the most centralized and well-known, Sumer's system did not operate through a single centralized 'divination monopoly.' Instead, it was a widespread network dispersed across cities like Ur, Uruk, and Nippur, permeating daily life. While kings sought the approval of priests in major temples for great affairs of state, a merchant could consult the priests in their own local temple.

One of the most intimate and effective methods in this decision-support process was the Dream Incubation (Incubation) ritual. Sumerian kings, before embarking on a large construction project or going to war, would fall asleep in a sacred corner of the temple and await a direct sign from the gods. The clearest example of this institutionalized dream divination is King Gudea of Lagash, who received the plan and instructions for the temple he would build directly from the god Ningirsu in a dream.

In fact, this tradition is the exact archetype, five thousand years old, of the practice still alive in Anatolia's collective memory: 'istikhara' (seeking divine guidance through sleep), or in popular usage, 'rüyaya yatmak' (lying down to dream). If we still lie down to seek a dream when faced with an indecision we cannot resolve, we are displaying the same ancient reflex as that Sumerian king: entrusting the uncertainty our consciousness cannot solve to the guidance of the unconscious or the divine, and seeking a kind of support.

While Delphi's prophecies were deliberately ambiguous and open to interpretation, this decision-support mechanism in Sumer functioned like a 'database of events' recorded on thousands of tablets. Expressions such as 'If there is a spot on the right side of the sheep's liver (risk), the king's army will be defeated (outcome)' transformed divination from a ritual into a kind of early statistical science based on accumulated past experience.

The Sumerian, by writing a promissory note on a clay tablet, was fixing the risk created by human agency; by having the Baru priest read a liver, or by lying down to dream, they were trying to measure the uncertainty created by nature and the gods. One was calculation-based, the other ritualistic, but the purpose was the same: to transform the darkness of the future into manageable data.

 

5. The Tablet of Enlil, the Tablet of the Merchant

All of this, the gods, the myths, the beliefs about fate, was genuinely believed. Enlil's decision was irrevocable, Namtar was unavoidable, the content of the 'Me', both good and evil, was unchangeable. Despite this, or perhaps precisely because of it, the Sumerian merchant would bow to Enlil's capricious fate at the temple in the morning, and then at their shop in the evening, lean over a clay tablet to secure themselves within that fate. The Sumerians knew how to fit both of these into the same world.

In tablets from the 3rd millennium BCE, we see interest-bearing loan contracts. Thirty-three percent on barley, twenty percent on silver. These rates were not set by gods, but by humans. In subsequent centuries, the Code of Hammurabi went a step further: if goods were lost on a trade expedition, cancellation of the debt became possible. The version of maritime insurance from four thousand years ago. Assyrian merchants recorded every transaction in clay along the caravan routes stretching to Anatolia. The world's first known promissory note was written within this network.

So this is what happened: The Sumerian merchant left fate to the gods, but took responsibility for risk themselves. The two were not the same thing. Fate was on Enlil's tablet; Risk was on the merchant's tablet, and thus uncertainty was on record. Enlil could send a storm (fate), but who would pay the debt for the ship that sank in that storm was written on the merchant's tablet (risk).

This distinction may seem small, but it is not. Making peace with what you cannot control, and putting what you can control into writing, the fact that both of these acts were performed simultaneously, by the same person, is perhaps one of the most important mental steps in the history of humanity.

 

5.1. The Flood: Reducing Risk to Zero, or Making It Livable?

In the flood section of Atrahasis, Enlil has grown weary of humanity's noise and decides to send a great flood. His solution might seem a bit radical: eliminate the threat entirely, wipe out uncertainty, destroy humanity, start from scratch. Enki, however, says no, not to Enlil, but to the outcome. He has Ziusudra build a ship, saving humanity, animals, and seeds. The flood passes.

Enlil's logic: Reduce risk to zero. Enki's logic: Make risk livable. These two approaches still confront us today. Should a system be shut down completely, or designed to remain standing even in the worst-case scenario? In finance and technology, we call this resilience. In politics, sustainability. In engineering, fail-safe. Sumer posed the first question, and Enki's answer aligns with the fundamental logic of modern risk management. The goal is not zero risk, but the ability to live within risk.

 

5.2. Inanna's Descent to the Underworld

One of the oldest narratives in Sumerian mythology is the story of a goddess who willingly goes to the threshold of death. Most Sumerian texts tell us of the heroic deeds of gods or the establishment of cosmic order. Inanna's descent to the underworld (Kur) departs from this pattern. There is no conquest here, no victory. What happens is stranger and more human: a goddess, without anyone forcing her, descends to Kur of her own free will.

Although the text does not clearly state why she went, some interpretations read this as an attempt at a power grab; others point to something more indirect, the desire to see death firsthand, to know it. Perhaps both at once. But the ambiguity of the reason does not weaken the story; on the contrary, it makes it more realistic. Because people, too, often cannot fully explain what draws them in a particular direction.

The underworld has seven gates, each with a price. At each gate, Inanna is forced to surrender one of the powers she possesses to the gatekeeper: first the crown, then jewels, her staff, and finally her royal garments. This slow stripping can be read symbolically, but the real power of the text lies elsewhere. With each gate, Inanna's invulnerability also melts away. When she passes through the final gate, the figure before us has completely lost her divine status, she is open and defenseless.

When she appears before Ereshkigal, the queen of the underworld, seven judges cast the 'gaze of death' upon her, and Inanna dies. She is hung on a hook and left there. In ancient Near Eastern texts, this scene has been repeatedly depicted as the symbol of absolute helplessness. But what is striking here is that death is portrayed not as instantaneous but as a suspended state, not an ending, but a waiting.

The portion of the story up to this point is dramatic, but not surprising, mythology is full of death scenes. The truly interesting detail is given before Inanna even sets out: the instructions she leaves for her faithful servant Ninshubur:

'Wait three days. If I do not return, go first to Enlil, then to Nanna, and finally to Enki. One of them will surely find a way.'

These instructions lift the text to another plane. While plunging into uncertainty, Inanna has already thought about the conditions of her return. Against the possibility that she herself could not activate the divine system, she has left a mechanism outside. This is not weakness, it is a sign of awareness. If the worst case comes to pass, the next step is already known.

In the end, help comes from Enki. He creates two small beings from the dirt under his fingernails and sends them to Inanna's side. These beings soften Ereshkigal, and Inanna is taken down from that hook and returned to life.

But the return is not a full-blown rescue either. Alchemists would call this 'equivalent exchange': to gain something, you must leave behind something of equal value. The underworld applies this law to the letter, Inanna can ascend, but she must leave someone to take her place. Nothing is returned without cost. The underworld is meticulous about this. Inanna pays this price, but that is another story.

 

5.3. Filing a Dissent Against Fate

Sumerian mythology was not written as a guide to risk management, yet within it, both mythologically and practically, lie the earliest traces of humanity's relationship with uncertainty.

Enlil's tablet of destiny could not be changed, but it could be stolen. Namtar was unavoidable, but healing goddesses could be summoned against it. The 'Me' contained evil too, and could change hands. In every impasse, Enki searched for a new path. Inanna prepared her plan before descending to the underworld. And throughout this divine framework, the Sumerian merchant was transferring risk from fate to writing.

The Sumerians left fate to the gods and kept risk for themselves. God's portion to God, humanity's portion to humanity, this distinction had already been made more than five thousand years ago.

The first notch the Sumerian scribe carved into clay looks, in hindsight, like the beginning of a long road. Pascal's probability calculations at the gambling table, Kahneman's experiments, the algorithms that fill our financial screens today, all of them circle back to roughly the same question: How do we eliminate uncertainty? What do we do with it? The Sumerians' answer was very simple: We make the distinction, we put it in writing, we measure and manage it.

Setting aside what was written on those tablets, this attitude is simultaneously the story of humanity's stance, its fear, its calculation, and its hope in the face of the unknown. Now let us fast-forward a little, leaving Sumer's skies, dusty streets, and seas behind, to look at the rational labyrinths of the modern world, to Bernstein's triumph, and to our minds' games with uncertainty.

 

PART THREE, On Living with Uncertainty

Risk, Modern Humanity

Between the Sumerian merchant's clay tablet and today's stock exchange lie five thousand years. But the distance between what that merchant did and what an investor does today is far shorter than we might imagine.

Some time ago I read Peter Bernstein's Against the Gods: The Remarkable Story of Risk. The book was written thirty years ago, but what it describes, 'humanity's relationship with uncertainty', feels so fresh. The uncertainty of the future, the not knowing, the not knowing what to do with that uncertainty.

When risk management is mentioned, finance immediately comes to mind: stock markets, portfolios, insurance policies. But Bernstein is speaking of something far more fundamental. What he describes is humanity's effort to wrest fate from the hands of the gods, or more precisely, the never-ending struggle it has waged in that pursuit.

 

6. Probability

We said that five thousand years passed from Sumer to Pascal, and for most of those five thousand years, uncertainty was firmly within the domain of the gods. In Ancient Greece, Tyche, blindfolded, rudder in hand, distributed fortune capriciously and unpredictably. For the Romans she became Fortuna; they erected her statues, sacrificed to her. You cannot know the future, so make peace with the powers that rule the future. Fulfill your obligations so that the powerful stand by your side. By their own lights and the spirit of their time, it was a coherent worldview.

The contradiction Bernstein draws attention to is this: The Greek world borrowed geometry and astronomical calculation from Egypt and Mesopotamia. Even Thales, considered the founder of philosophy, was from the Ionian coast of Anatolia, most likely of Phoenician origin, he studied in Egypt and taught in Miletus. I write this to show the flow of knowledge. The Greeks' original contribution was not taking this knowledge but what they did with it: their effort to tie natural events not to the whims of gods but to unchanging principles. Proof, deduction, induction, the question of 'why', but it was precisely this question that blocked the path toward probability calculation. To express the future in numbers, to open it to discussion, meant stepping into the domain of the gods. Some doors remain unopened, not because they shouldn't be opened, but because the time has not yet come.

The paradox of the Greek world: having inherited knowledge and being capable of doing so much with it, yet coming to a stop precisely on the matter of calculating risk. This, of course, does not mean the Greeks lived at peace with uncertainty. On the contrary, they developed an extraordinarily sophisticated system for managing it, not merely mathematical, but institutional.

 

6.1. Delphi

To think of Delphi simply as a place of prophecy is to sell it short. From today's perspective, a more accurate description might be: the most effective uncertainty management institution of the ancient world.

From the 8th century BCE onward, for roughly a thousand years, the Greek world did not declare war, establish colonies, form alliances, or make major commercial decisions without consulting Delphi. The Pythia, the priestess at Apollo's temple, would enter a trance state on a tripod and give her response. The answers were almost always ambiguous, and this ambiguity was not a flaw but the very heart of the system. (Note: According to legend, Apollo killed the giant serpent Python that inhabited the sacred site at Delphi in order to claim it. The name 'Pythia' derives from this serpent. Apollo's defeat of chaos to bring order, and prophecy, symbolizes the taming of wild nature.)

The story of Lydian King Croesus is one of the most striking tragedies in the ancient world concerning the management of uncertainty and the misreading of knowledge. According to Herodotus, before taking action against the rising Persian threat, Croesus subjects the leading oracular centers of the age to a 'truth test,' sending emissaries to seven different centers and asking them to name what he is doing at that very moment. Only the Pythia at Delphi passes this impossible test, by knowing that the king is at that moment boiling a turtle and lamb in a bronze cauldron, and thereby earns his unshakeable trust. Intoxicated by this 'verified' knowledge, and after making enormous golden donations to Delphi, the king asks his famous question: 'Should I make war on the Persians?' The Pythia's reply, 'If you cross the Halys (the Kızılırmak River), a great empire will be destroyed', is interpreted by Croesus as a prophecy of his own victory. But when the king crosses the Halys with his army and loses the war, he learns bitterly that the empire destroyed was not that of the Persians but his own. This narrative is the oldest example of how information, even when technically correct, can become the instrument of systemic ruin when interpreted through subjective desires and a one-sided perspective, a 'self-fulfilling prophecy of one's own downfall.'

It is possible to read this story as an account of a bad prophetic system. But it can also be read differently: the Pythia did not give Croesus certainty, she returned uncertainty to him as it was. The sentence 'An empire will fall' did not make clear which empire was meant. Croesus's error lay in his interpretation, his raw courage, his desire to transform uncertainty into prediction. In a modern analogy: the model gave the correct signal, but the decision-maker turned it into determinism.

Esther Eidinow's research on this subject reveals something striking: Greeks typically went to an oracular center to have a decision they had already made validated. The questions were most often phrased as 'Should I do this?', that is, in a yes-or-no format. This turned the oracle not into a decision-making tool but a decision-legitimizing tool. Uncertainty was not eliminated; it was simply made easier to carry. The god had approved it, even in the worst case, responsibility was shared.

Looking from Eidinow's ancient perspective back toward the Sumerians, they offer a magnificent answer to the second half of this article's question: 'How did humanity take fate from the hands of the gods?' The Sumerians, by recording risk, provided a tremendous response.

For the Sumerians, writing was a way of freezing uncertainty by transforming it into a universal library (alamatu), they saw the world as a vast tablet to be read. For the Greeks, while writing was an advanced tool, the real authority at the moment of risk was not the fixed text but the text's immediate and ambiguous interpretation. While the Sumerian archived risk as 'past data,' the Greek constructed it as a 'future narrative.'

Sumerians managed risk like a statistical archive (an enormous catalogue of past events). Greeks managed risk through narrative legitimacy (immediate interpretation and political approval). Modern humanity manages risk through probabilistic simulation (mathematical calculation of future scenarios).

Alongside this, there were curse tablets, katadesmoi. Eidinow describes these as the exact reverse side of the oracle: while with the oracle people tried to look past uncertainty, with curse tablets they tried to preemptively prevent possible future harm. For a rival to fail, for a lawsuit to be won, to return safely from a journey. The common ground: both were practical responses to the anxiety created by uncertainty. The oracle and the curse, two hands trying to hold the two faces of fortune.

In Rome, the same function was performed by augurs, priests who interpreted the flight of birds, the direction lightning struck, and the internal organs of animals. Before battle, a sacrifice would be made, the liver examined, and a decision reached. This too was an ambiguous system, open to interpretation, and therefore seemingly infallible. But functionally it was no different from the oracle: taking uncertainty and placing it within a ritual, making it manageable.

No one in the ancient world tried to reduce uncertainty to zero. They tried to place it within a legitimate framework, and by their own standards and time, it was well constructed.

 

6.2. Pascal, Fermat

In 1654, letters were exchanged between Blaise Pascal and Pierre de Fermat over a gambling problem posed by a French nobleman. How should the stakes be divided in an unfinished game? Today we might call it a middle school math problem. But in those letters, one of the most critical ideas in the history of humanity was born: Can the probability of something that has not yet happened be calculated?

Until that moment, the word 'probable' was, as described above, almost a philosophical abstraction. What Pascal and Fermat did was to render it in numbers. It was not possible to know the future perfectly, but it was possible to measure the uncertainty of the future.

Bernstein calls this 'a triumph over the gods.' I am somewhat more cautious. Was it a triumph, or was it reinventing them in a different guise?

 

PART FOUR, The Blind Spots of Reason

For three hundred years, probability theory made enormous strides, Bernoulli, Gauss, the portfolio theorists of the 20th century. At one point it seemed as though the work was done; we could now put risk into numbers.

Before Kahneman and Tversky disrupted this picture, everyone believed it. The experiments they conducted in the 1970s were unsettling: people did not make rational decisions in the face of uncertainty, and experts behaved the same as ordinary people. Similar errors, the same patterns, occurring not randomly but in predictably consistent ways. For example: Winning 100 lira and losing 100 lira looks mathematically equivalent, but our brains do not perceive it that way. The weight of losing is roughly twice the lightness of gaining, a small asymmetry that explains a great deal.

Why do we hold onto a losing stock? Why do we sell a winning one too early? Why does eighty percent success not feel the same as twenty percent failure, even though the mathematics is identical? It is clearly about how our brains work.

Kahneman speaks of two systems. One is fast, one is slow; the slow one makes better decisions but tires quickly. After that, the fast one takes over, and what we often think of as intuition turns out to be fear. Does knowing this save a person? Probably not, but it is better than going in blind.

 

7. The Modern World's Flood: Black Swans

For the Sumerians, the Flood was not simply a destructive natural event, it was the moment when the entire order of the 'Me' collapsed entirely, when unpredictability reached its peak, that 'moment of absolute uncertainty.' Thousands of years later, when Nassim Taleb introduced the concept of the 'Black Swan' into modern literature, he was speaking of the same ancient fear: those great rupture moments when the future cannot be predicted by looking at past data.

The famous 'turkey problem' Taleb uses to explain this theory illustrates statistics' greatest blind spot: For a turkey that has been fed by its owner for a thousand days, the probability of the thousand-and-first day also being a feeding day is, by past data, perfect, but that day is Thanksgiving, and the turkey's throat is cut. The turkey's tragedy lay not in its statistics being wrong, but in not knowing that a catastrophe it had never experienced (the act of being slaughtered) could not be captured by statistics.

When we place Taleb's famous triad, rarity, enormous impact, and the post-hoc rationalizations of 'it was obvious all along', beside the descriptions of the Flood in Sumerian tablets, we see that our fears have not changed at all. The Sumerians had tried to impose a logic on the Flood by attributing it to a momentary burst of rage from Enlil, a divine caprice. Today, with a similar reflex, we find it difficult to acknowledge that we view economic crises or global upheavals as minor deviations from our models, and that those models were built from the start with 'turkey logic', believing that looking at yesterday's sunshine could predict tomorrow's flood.

Yet Enki's secret plan, whispered to Ziusudra, is in fact humanity's very first genuine 'Plan B.' You cannot know when the Black Swan will beat its wings, but you must have already built a ship that won't sink when it arrives. Risk management is never about trusting those arrogant statistical calculations that claim the storm will never come, it is about accepting the inevitability of the storm and building a resilient, adaptable structure that will remain above water.

 

7.1. Money, Portfolios, and the Arrogance of Models

Financial risk management gained genuine maturity in the 20th century. Harry Markowitz developed portfolio theory: holding assets that move in opposite directions reduces total risk. With each step, uncertainty seemed to be coming a little more under control.

Then 2008 arrived.

The world's largest financial institutions collapsed at the very heart of their mathematical models. Things that the models said were 'a one-in-a-trillion chance' came to pass. Nassim Taleb, as mentioned earlier, called this the 'black swan.' Models cannot see what has never been seen before, because models learn from the past, and things that have never existed in the past have no statistics.

This does not mean mathematics is useless. It means that risk measurement has a structural limit. Bernstein says the same: even the most sophisticated tools ultimately have to rely on human intuition, habit, and experience. Risk management is a science, but it is also an art.

For everyday life, this means: don't put all your savings in one place. This applies not only to stocks but to sources of income, skills, and relationships as well. Diversification is portfolio theory's most powerful idea, one that extends far beyond the stock market.

 

PART FIVE, Environmental and Existential Risks

8. Climate: What We Cannot Calculate

Climate change is one of the most important topics of recent years, and perhaps one of the most complex areas for risk theory, one of those domains where conventional approaches don't quite fit. In normal risk scenarios, we learn from the past and try to predict the future. For earthquake insurance, for instance, there is seismic data going back more than a hundred years; for life insurance, actuaries have mortality tables. But when it comes to climate risk, we find that records of past events are sparse. We are trying to predict the future behavior of an environmental and natural system we have never experienced before, and we don't know, or barely know, whether the system itself will remain stable.

Economist Nicholas Stern, in the Stern Review, defined climate risk as the greatest externality in the history of markets. One of his examples is this: a factory emits carbon without paying for it; the cost is passed forward into the future, dispersed, rendered ambiguous. Not one of these companies records this as a balance sheet item, until they are forced to see it.

When we add Kahneman's findings here, we see that people systematically underestimate distant and uncertain risks. Something that will happen in 2100 does not feel real to our minds, does not register emotionally. This is precisely where the mechanics of climate risk matter. As I mentioned above, climate risk works like compound interest, a small negligence today returns decades later as a compounded headache, a compounded burden.

The human mind that has evolved risk management is, ironically, also coded to feel this type of risk lightly. We respond to near, concrete, immediately felt threats, but we are blunted to distant and uncertain ones. Is this a moral problem, then, or a cognitive design flaw? The two are entangled.

Cognitively, the brain we inherited from ancestors who were chased by lions on the savanna cannot perceive slow-fuse bombs that will detonate centuries from now. Let alone that, in our world shaken by computerized warfare, we cannot even register deaths in other countries. We are blunted to what is not at our doorstep. Morally, we find ourselves inside a crime whose perpetrator is lost among papers and made ambiguous, whose victim will not be born for centuries. We hide and disperse responsibility so subtly across space and time that our conscience is not crushed beneath it. With these design flaws (let us not fall into the trap here of saying: what can we do, that's just our nature. No, because we know what we are doing, because we are aware, this burden remains with us), that is, in the shadow of the enormous risks we ourselves have created, one question looks forward: If our nature cannot grasp the future on this scale, how do we save that future?

 

8.1. Life, Uncalculated

When we reflect on the subjects we have covered, from the Sumerian merchant's clay tablet, to probability calculations, to how the human mind works, to the 2008 crisis, we must historically ask: How do we live without knowing the future?

Risk management is our longest-running answer to this question. We poured uncertainty from the gods onto tablets, into papers, into probability calculations, we put a price on it. Portfolio theory (don't put your eggs in one basket, diversify) laid out the mathematical dimension of this process. Kahneman showed us our own mental shortcuts. All of these have taken their rightful place in our history as real achievements.

But when we got here, we learned something else as well: every new tool we developed also brought a new blind spot with it. Probability calculation arrived, and we began to more comfortably ignore risks we couldn't measure. Portfolio models arrived, and we became more exposed to shocks outside the model. Artificial intelligence entered our decision-making processes, and finding where responsibility lies became even harder.

Let's return to Bernstein's title: How much progress have we made against the gods, does it look like we can win? We cannot control the dice, but we can calculate probabilities. We cannot topple Fortuna, but we can found insurance companies to protect ourselves from her. We may not be able to stop climate catastrophe, but we can build carbon models.

We see that risk management does not eliminate uncertainty, but it does make it livable, it places it before us in a visible form. To exist by thinking with the future rather than fearing it is a new kind of risk, but we can also call it a human one.

 

8.2. What Remains

So what might lie beyond what Bernstein called 'triumph'?

At this stage, our approach to uncertainty appears one-directional: reduce it, manage it, transfer it. Collect more data, build better models, predict more precisely. We have seen that uncertainty is a problem, a condition to be solved, and how it has been handled from the Sumerians onward.

In the 20th century, physics showed us something else. Heisenberg's uncertainty principle reveals that you cannot simultaneously know both the position and the velocity of a particle with precision. This arises not from measurement error but from the structure of the universe itself. In other words, uncertainty is not merely a product of our ignorance, it is a property built into reality itself. Accepting this is quite a different starting point, isn't it.

The second issue is psychological. The brain tries to quickly eliminate that cognitive tension, the sense of threat, that uncertainty creates. This is why, instead of waiting for a rational analysis, it latches onto the first certainty it finds, even if that certainty is wrong, and silences the voice of uncertainty. To build a different relationship with uncertainty, one must first recognize this reflex. Psychology calls this 'Tolerance of Ambiguity', but even 'tolerance' is the wrong word. It implies that uncertainty is a pain to be endured. Yet some people, some cultures, carry it differently: with curiosity, openness, even as a source of energy. The same uncertainty paralyzes one person while it spurs another into motion. The difference is not outside, it is within. (Tolerance of Ambiguity: a concept introduced by Else Frenkel-Brunswik in 1948. The central question: what do people do when they encounter situations with no clear answer?)

A writer, for instance, sits down at the desk without knowing what the outcome will be, and writes; sometimes they veer off into new directions along the way, and this propels them forward rather than stopping them. Feynman considered saying 'I don't know' a virtue. The best risk managers are also those who accept that the model does not cover everything. The Japanese aesthetic of wabi-sabi sees imperfection as beauty; Taoist philosophy considers uncertainty the natural state of things, recommending flow instead of resistance. The Western world's (which is the side I have been presenting throughout this text, I hope on another occasion I can bring in other cultures as well) quest for certainty is not a universal, singular truth.

The third issue is practical. Current risk management is largely defensive: prevent the bad, minimize the loss, prepare for the worst-case scenario. But there is another question worth asking: What would we lose without uncertainty? Entrepreneurship finds its greatest returns in the most uncertain fields; science is born in questions whose answers are unknown. Uncertainty is not merely a risk to be managed, it is also the ground from which everything emerges.

Perhaps the story of the war waged against the gods is not a victory narrative. Everything we thought was a triumph brought with it a new question. We measured uncertainty, and the unmeasurable grew. We built models, and what lay outside the models struck us.

But we also saw this: the greatest things were born in that very dark space. Science in questions without answers, art in beginning without knowing the end, entrepreneurship in uncertain steps.

The Sumerian merchant knew this instinctively, bowing to Enlil in the morning, then bending over their own tablet in the evening. They left fate to the gods and stayed with risk themselves. Perhaps that is still the point: knowing what to hold onto, and what to let go.