The first pale light of dawn seeped through the floor-to-ceiling windows like a thin blade, slowly and silently dissecting the night's depth within "The Nest." The light carried no warmth—instead, it bore a metallic coldness, as if reflected from the lunar surface, illuminating without comforting. Data streams continued their silent surge across the screens, emerald characters swarming like phosphorescent krill in the deep sea—flaring and extinguishing in clusters. They no longer carried the euphoria of discovering new continents from the night before; rather, they hung with the frostbitten reality of leaves after a snowstorm, draped in a layer of cold, almost cruel shadow. In the air, the low-frequency hum of cooling units intertwined with the breathing of server fans, weaving time into a viscous, almost tangible texture that one could tear apart with bare hands.
Mozi stood alone at the console, his silhouette sharpened and thinned by the screen's glow into a dagger sheathed yet threatening to snap. Yue'er had departed quietly at 3:27 AM—the door hinge emitting a soft *click* like the closing of a heart valve, carrying away the lingering scent of citrus and cedar from her presence, along with the last residual warmth of last night's intellectual and emotional tempest. He could still sense that faint fragrance drifting beneath his nostrils, like a fish reluctant to leave, yet he forced himself to fold all of it—the scent, the arc of her departing figure—into a tiny, untouchable amber, locked deep within the darkest drawer of memory.
Now, his gaze was knife-sharp, yet not directed outward but inward—toward that arrogant soul steeped in code and causal chains for years, once believing that sufficient computational power could approximate the universe's essence. The results on screen arrived like a belated judgment: after a night of emergency deep analysis, the model exhibited non-convergent oscillations at the third layer of recursion, like an elevator suddenly unplugged, suspended at the edge of a black hole. Yue'er's metaphor of the "generalized fluid" was indeed illuminating—she had imagined financial markets, biological neural networks, geomagnetic disturbances, even urban emotions as a superfluid with variable viscosity, sharing the same conservation laws within a higher-dimensional "stress-torsion" tensor field. Yet when Mozi truly attempted to write cross-scale risk propagation as a solvable set of partial differential equations using tensor networks, he confronted a heart-stopping "uncertainty"—not the Bayesian randomness tameable by prior distributions, but a Knightian abyss where even the event space could not be enumerated. You don't know what might happen, let alone calculate its probability or impact; like a blindfolded man standing at a cliff's edge, unaware whether ahead lies flat ground or abyss, or whether the very concept of "ahead" holds any meaning.
This uncertainty far exceeded what those well-dressed risk managers in financial markets cherished as VaR or ES. VaR says: "At 95% confidence, your maximum loss tomorrow is 10 million." ES adds: "Should you fall into that 5% tail, expect to lose 40 million on average." They resemble two undertakers in suits wielding calculators, planting warning signs at the boundaries of the known world while remaining blind to the unnamed creatures of the night. Yet the "source perturbation" Mozi now faced was precisely such a creature of darkness—first captured at the silver needle's tip in Xiuxiu's laboratory: when the stainless steel needle penetrated 0.3 *cun* into the subject's "Taichong" acupoint, the oscilloscope suddenly registered an aperiodic, undamped electrical potential pulse with exponentially amplifying energy, its spectral characteristics perfectly isomorphic to the "ghost orders" in the CSI 300 futures order book at 2:17:42 last night. The second appearance came in the magnetic field monitoring channel of the geostationary GOES-16 satellite—a magnetic twist knot faster than an express train dragged the geomagnetic H-component 47 nanoteslaskew in 1.8 seconds, while simultaneously, Pudong Airport's control tower received an A320 captain's report: "All attitude indicators simultaneously showed 3-degree deviation, as if an invisible hand had twisted the aircraft's nose." The third manifestation Mozi observed himself in backtesting code—treating those two events as "0" and "1," the past 36 months revealed 47 micro-flash crashes across 19 major global exchanges, 7 treasury bond meltdowns, and 2 Bitcoin deep waterfalls, all strung like prayer beads on a single dark thread, emerging precisely every 1200±5 hours with error margins below 0.3%.
The model automatically killed its process at the fourth recursion layer, as computational power could no longer locate a convergent initial condition. Mozi stared at the cluster of red equipotential lines infinitely fractaling like cancer cells, feeling for the first time the true weight of "unknown." It was not an adjective but an entity with mass, slowly crawling out from the monitor onto his collarbone, pressing him inch by inch toward the ground. What was this mysterious "source perturbation"? An undiscovered cosmic string vibrating randomly in the background? A byproduct of new coupling modes between solar wind and the magnetosphere? Or something darker, more suggestive of "intention"—like an invisible chess player simultaneously moving pieces across three boards: financial markets, bioelectricity, and geomagnetism? If it possessed intention, what was its objective? If intentionless, that was more terrifying—it meant humanity merely happened to pass through a field swept by invisible buckshot, lacking even the qualification to be a "target."
He pulled up the financial domain simulation animation: a perturbation 1.7 orders of magnitude beyond historical records evaporated 92% of order book depth within 200 milliseconds, instantly igniting Herd Behavior in high-frequency strategies—like a herd of antelope grazing peacefully until simultaneously catching the lion's scent, collectively wheeling toward the same gap. Dark liquidity in black pools was torn into shreds, price curves snapping like broken rulers,弹射 downward 8% to trigger second-tier exchange circuit breakers. Worse, since the perturbation's coupling frequency with human bioelectricity landed at 7.83 Hz—precisely Earth's Schumann resonance base frequency—several veteran market makers in the trading hall simultaneously developed sinus arrhythmia in the same second, fingers missing the keyboard and failing to cancel orders. Finance and flesh, code and heartbeat, bound together by an invisible string, trembling in synchrony.
And this was merely finance.
Xiuxiu's experimental report lay at the bottom of the encrypted folder, like an unexploded detonator. She had recorded physiological indicators of 12 subjects at the perturbation's occurrence: skin conductance universally elevated by 2.4μS, heart rate variability plummeting below 0.05. More bizarrely, all subjects reported "a horizontal white line flashing before their eyes" in the same second—the line's height pixel-perfectly aligned with the Shanghai Composite Index's instantaneous drop at 14:32:17 that day. Mozi recalled her words from last night's video call: "If intensity increases another 3dB, I cannot guarantee their hearts won't stop." She spoke while holding a 0.25×40 silver needle, its tip gleaming like a drop of water refusing to fall, reflecting the worry in her pupils. In that moment, he suddenly realized he faced not some publishable anomaly but a Damocles sword forged from dark energy, suspended above billions.
"Unity of knowledge and action." These four characters pressed heavily upon his heart like four water-soaked blue bricks. Knowing some vague yet extremely dangerous truth, he must act. But how? Report to regulators? He could almost envision the hearing: himself in his only dark suit, at a conference table draped in beige cloth, facing rows of skeptical faces, narrating the trinity of "cosmic perturbation—meridians—flash crash." The best outcome: polite dismissal. The worst: premature leak, social media exploding with "doomsday" and "conspiracy" trending topics within half an hour, global markets completing a self-fulfilling prophecy in panic. Publish research findings? Without rigorous verification and countermeasures, this equaled lighting a torch beside a powder magazine—one doused in gasoline. Act alone? He could use his algorithms to reverse-trade within the millisecond window of perturbation emergence, deploying massive capital as buffer to drag prices back toward "rational" ranges. Yet this required at least 30 billion in capital pools and solved only the financial layer—for the perturbation itself, for its potential cascading impacts on human bodies, aircraft, geomagnetic navigation, power grid frequencies, he was powerless. Like seeing a tsunami approach yet attempting to scoop back the wave with a soup ladle.
Helplessness crept like tide, inch by inch across his chest. For a decade, he had believed code was a scalpel—sharp enough algorithms could dissect the world's belly and excise the tumor. Today, for the first time, he discovered the scalpel touched not tumor but abyss—the abyss has no belly, only an eternally chewing mouth. He recalled the recurring phrase from *Dune* read in college: "Fear is the mind-killer." Yet now the truer version seemed: "Uncertainty is the solvent of will." It first dissolves confidence, then direction, finally reducing you to a spinning top rotating in place, even the right to fall denied.
He opened the encrypted communication channel with Yue'er and Xiuxiu. Their names appeared side by side on screen like two lamps refusing to extinguish in the night. Yue'er's avatar was a Möbius strip; Xiuxiu's, a ginkgo leaf. Mozi stared at those two lights, suddenly realizing why helplessness hadn't completely crushed him—because beneath his feet stood them: one describing the universe through mathematics, one tuning human bodies through silver needles. The three of them, by some twist of fate, had each grasped different thread-ends of this colossal puzzle—he held finance and algorithms, Yue'er held geometry and topology, Xiuxiu held life and energy. Three threads continuing separately would only tear the puzzle into thirds; but twisted together, they might weave a net to capture that creature of darkness—even for one second, enough for humanity to glimpse the shape of its teeth.
He took a deep breath and began drafting a message. No longer to Yue'er alone, but simultaneously to both Yue'er and Xiuxiu, establishing a three-person encrypted group. Subject: ["Uncertainty" Assessment and Preliminary Response Framework]. The content was calm, structured, clear as his code documentation: event definition first, then cross-domain data validation, followed by three-tier risk classification, finally candid acknowledgment of his limitations and concerns regarding response strategies. He made no mention of what had transpired between himself and Yue'er last night—that belonged to another dimension of private space, like extra dimensions generated when two high-dimensional universes accidentally overlap in three-dimensional reality, compressing into a singularity once spoken.
"...Therefore, I believe we face not merely a scientific problem, but an urgent risk management issue concerning social stability and individual safety," he wrote. "Solo efforts cannot address uncertainty of this magnitude. I propose we convene a three-person meeting as soon as possible to share all data and understanding, jointly determine next research priorities, and assess whether and how to issue warnings to specific levels." Send. The message transformed into an encrypted data stream, like a spore packed into a miniature submarine, diving into the fiber-optic deep sea, vanishing into network depths.
Mozi turned toward the gradually awakening city beyond the window. Towering buildings, their glass curtain walls fragmenting the rising sun into countless shards of gold scattered across traffic lanes like a crushed Milky Way. Vehicles began converging; the first queue at red lights resembled a spine just awakened, vertebra by vertebra, writhing. Countless people would soon begin ordinary days: white-collar workers scrolling phones in subways, students queuing at breakfast stalls, nurses just off duty in hospital emergency rooms—all oblivious to the underlying currents. The gap between this "knowing" and "ignorance" congealed into lead in his stomach. "Worry for the country and its people" was no empty phrase—when the abstract "country" and "people" faced threat from an unknown force, that concern became concrete and heavy, like extracting one's internal organs to place upon a scale, watching the pointer shift bit by bit.
He knew sending that message meant binding the three of them more tightly together, meant stepping into an even more unknown, potentially more dangerous domain. Once they decided to join forces, there would be no turning back: they would become each other's firewalls, and each other's detonators. Any error by one would drag the other two into the abyss through chain explosions. Yet he had no choice. The Uncertainty Principle tells us that at certain levels, precise position and momentum cannot be simultaneously known; and facing this civilization-scale "uncertainty," perhaps the only "certainty" was the necessity of advancing together with companions through the fog.
Server fans emitted a slight acceleration, like distant calls from deep-sea whale pods. He waited for response, awaited echoes from the mathematical universe and the universe of life. Seconds passed; the clock in the screen's upper right jumped from 06:59:55 to 07:00:00 like an invisible relay baton tossed into the air. Outside the window, the first sunbeam finally cleared the lightning rod of the opposite tower, striking his face directly—the light still pale, yet bearing an imperceptible warmth. He closed his eyes, allowing the light to brand an inverted cityscape upon his retina. In that moment, he suddenly recalled Yue'er's final words before departure last night: "If the world is destined to burn in the unknown, then we can at least be the firewood that crackles before burning, letting those near the fire hear some warning."
He opened his eyes, gaze returning to the screen where emerald characters continued scrolling like ceaseless tides. He knew, regardless of whether they replied immediately, regardless of when the next perturbation descended, he had permanently deleted the option of "bearing alone" from his life's parameters. All that remained was waiting, and—before response arrived—continuing to write code, continuing to model, continuing to translate the abyss's teeth inch by inch into human-readable syntax. For that was the only small yet stubborn "certainty" he could grasp at this moment, his only weapon against "uncertainty."