Night had deepened, but Mozi's "Nest" was more noisy than daytime. Not the noise of sound, but the wild dance of data. On the giant holographic screen, abnormal fluctuations from financial markets, weak ripples from cosmic background radiation, and the experimental data Xiuxiu had just shared recording human body meridian responses to specific fields, like three differently colored strange rivers, galloping and converging. The blue-purple financial curve was twisted into dead knots by invisible hands, then suddenly straightened in the next nanosecond; the dark red CMB ripples were like ancient heartbeats, every weak rise and fall carrying billions of years of dust; while Xiuxiu's emerald green meridian response spectral line was like a spring vine suddenly awakened in the night, growing wildly along the time axis, precisely crashing into the other two rivers at a certain second, splashing waves invisible to the naked eye yet sufficient to shake the world. Yue'er and Mozi had been working here continuously for more than twelve hours. Pizza boxes and empty coffee cups were scattered in the corner of the console, unattended. The air was permeated with a high concentration of almost suffocating intellectual agitation and some quietly growing, indescribable tension. That tension was like a string pulled to the limit, one end connected to the unknown of the universe, the other tied to the hearts of the two people, every data jump tightening the string another micron, emitting silent hums. Xiuxiu's data was like a key puzzle piece, instantly pushing their research into a new, more shocking dimension. That mysterious "source perturbation," could not only cross cosmic scales and human collective behavior, but could actually interact with the deepest energy system of the human body! The cross-validation results on the screen declared with cold numbers: at Greenwich Mean Time yesterday 23:47:21.003, meridian conductivity surged 7.3 sigma, NASDAQ index futures flash crashed 0.4% 0.8 seconds later, while the BICEP array at the South Pole recorded a 4.2 sigma deviation marked as "non-Gaussian tail" in CMB temperature anisotropy 11.2 seconds before. The joint probability of triple coincidence was lower than 10^-23, equivalent to randomly selecting a specific hydrogen atom in the observable universe.
"This can no longer be explained by coincidence." Yue'er's voice carried a trace of exhaustion, but more of a hoarseness after extreme excitement. She pointed to the overlapping area of the three data streams after time alignment and pattern matching on the screen, "Look, the field pattern peak time that induced the meridian response in Xiuxiu's experiment, after different propagation delay corrections, is almost perfectly synchronized with the abnormal fluctuations in financial markets and the CMB perturbation we captured!" Her fingertips trembled slightly in the air, like a conductor passing strong current, transmitting that excitement burning from nerve endings to cerebral cortex to every inch of darkness.
Mozi stood beside her, arms crossed over his chest, brows tightly locked. His profile was outlined more coldly by the screen light, but his eyes burned with the same flame as hers. "This means there exists a common perturbation source, whose influence penetrates into the physical universe, financial systems constructed by human collective behavior, and even individual biological energy fields in different ways, at different speeds." When he said this, his voice was so low it was almost inaudible, yet like a neutron star of extreme density, attracting all surrounding attention.
To understand this cross-scale, cross-domain "penetration" mechanism, Yue'er's thinking returned to her most familiar field—the mathematics describing complex system dynamics. Her pupils dilated slightly in her irises, as if to suck the entire screen into them; on her retina, every blood vessel became a tiny Floquet orbit, carrying information about periods, chaos, and modal coupling.
"We need a framework to describe how this... 'perturbation' propagates and evolves in various media." she murmured to herself, fingers unconsciously tapping on the virtual keyboard, calling up a set of equations that have haunted countless mathematicians with both fascination and headache—"Navier-Stokes Equations." The smooth screen was instantly filled with complex partial differential symbols, those ∂, ∇, ν like living miniature creatures, wriggling, mating, splitting on the two-dimensional plane, trying to find a smooth path that wouldn't tear itself in three-dimensional turbulence.
"Navier-Stokes Equations," Yue'er explained, her tone like in a classroom, but her gaze never leaving the equations, "are the foundation of fluid mechanics. They describe the motion of viscous fluids. Look," she pointed to the terms in the equations, "this represents inertial force, this represents pressure gradient, this represents viscous dissipation... they capture the core physics of fluid motion." Her voice grew lower and lower, finally almost becoming a spell, as if with enough devout recitation, the equations would themselves spit out that million-dollar smooth solution.
She paused, her tone becoming profound: "But its most fascinating and most frustrating aspect is—the existence and smoothness problem of its solutions has not yet been completely resolved, it is one of the Millennium Prize Problems with a million-dollar bounty from the Clay Mathematics Institute. We cannot even be completely certain whether, in three dimensions, its solutions always exist and are smooth, or whether turbulence essentially means rupture of solutions."
Mozi gazed at that set of equations, he could understand the physical meaning behind them, and also feel their mathematical depth. "Are you implying that the propagation of this 'perturbation' is like some kind of 'generalized fluid' we cannot fully understand?" His voice was like coming from a deep well, with echoes.
"Something like that!" Yue'er turned around, her eyes astonishingly bright, she finally moved her gaze from the screen to Mozi, "We can imagine spacetime itself, the information flow of financial markets, even the meridian qi and blood of the human body, as some kind of abstract 'fluid.' And this 'source perturbation,' like a stone thrown into these fluids, the ripples it arouses will spread, evolve, and interact in their respective different ways. In some media, it may propagate smoothly; in some media, it may amplify, distort, even produce turbulence-like violent fluctuations due to nonlinear interactions! And human body meridians may be another medium particularly sensitive to such 'information fluids!'"
Her metaphor was bold and enlightening. This was no longer three isolated phenomena, but a unified, cross-different abstract levels "fluid dynamics" problem! And that Navier-Stokes existence problem that has troubled mathematicians for a century, was like a huge metaphor: their understanding of this "perturbation" is also facing the profound uncertainty of whether it is "smooth" or will go toward unpredictable "turbulence singularities."
This cognition plunged both into brief silence. They stood at the edge of an unknown field, the ground beneath their feet might be solid land, or might be a bottomless abyss. In the silence, the server fan noise suddenly became deafening, like countless moths simultaneously hitting a glass cover, trying to shatter that transparent barrier, letting the flames of numbers burn into reality.
After long periods of extreme focus, mental relaxation suddenly came, followed by overwhelming exhaustion and an uncontrollable emotional surge. They shared this astonishing discovery, shared the trembling standing at the edge of cognition, this high degree of intellectual resonance and emotional resonance fermented in the enclosed space, becoming incomparably mellow. Yue'er subconsciously raised her hand, wanting to tuck a strand of slipped hair behind her ear, but found her arm somewhat numb from maintaining one posture for a long time, the movement slightly awkward.
Almost at the same moment, Mozi noticed her subtle frown and stiff movement. Without any words, he extremely naturally extended his hand, warm fingers gently grasping her wrist, another hand extremely gently helping her tuck that strand of hair behind her ear. His movements were somewhat unpracticed, completely different from his flowing manipulation of code, even carrying a trace of imperceptible trembling. But the temperature of his fingertips, transmitted through the skin, was clear and burning real.
Yue'er's whole body froze. The sensation transmitted from her wrist, and the sense of pressure of his sudden approach carrying a faint clean scent, pulled her brain instantly back from the vast mathematical universe to reality. She raised her eyes, crashing into his deep eyes. Those no longer contained only data and logic, but also surged with some complex and burning emotions she had never seen before.
The air seemed to solidify. Only the server continued its tireless low hum, the vast data flow on the screen still galloping silently, witnessing this sudden moment.
No superfluous words.
He lowered his head, kissing her.
That was not a gentle tentative probe, more like an eruption accumulated for a long time, originating from the deep resonance of souls, carrying algorithm-like precision and unquestionable force, directly capturing her lips. Yue'er's mind went blank, Navier-Stokes equations, singularities, fluid metaphors... all hardcore mathematical concepts instantly evaporated. Replaced by a more primitive, more turbulent "turbulence" exploding in her body. She subconsciously wanted to push away, but that force holding her wrist was gentle yet firm, and the pure desire and absolute intellectual sense of identity in his kiss made her lose all will to resist.
Instead, she began to respond. Arms encircling his neck, fingers interlacing into his thick black hair. Equations were cast to the back of the mind, now only the flood of senses remained—the slight bitterness of coffee remaining between his lips and teeth, the radiator-like warmth of his body, and that indescribable, strong attraction of two top minds confirming each other after conquering the unknown.
The light on the holographic screen still flickered, illuminating the two people tightly embracing beside the console. Abstract mathematics and real lust, cold code and warm body, at this moment reached strange and harmonious unity.
As if they were jointly solving another existence theorem—whether two lonely and outstanding souls, on the journey exploring ultimate truth, can find each other's smooth solutions.
The answer, seemed to exist in this long and deep kiss, in the clothes quietly sliding off shoulders and gradually rising body temperature.
Tonight, thinking about the "perturbation source" temporarily came to an end.
And about the "Navier-Stokes Equation" of another form existing between them, the existence and smoothness of its solutions, was being explored and verified most directly and deeply by each other's bodies and emotions. The server fan sound suddenly became gentle, like a wordless white noise lullaby, gently holding two tired yet burning souls. The three rivers on the screen still ran, yet at a certain instant simultaneously showed extremely subtle tremors—as if the entire universe secretly held its breath, making way for this private proof. Time was stretched into a sticky honey thread, dragging every heartbeat, every breath, every subtle change in skin contact electrical conductivity, writing them into lines of new, not yet public code.
Yue'er felt herself like a recompiled thread, priority quietly raised to highest, CPU cache full of the temperature of his tongue tip. She vaguely heard the sound of blood turbulence in her own blood vessels, that sound shared the same Fourier spectrum with distant city night traffic, with high-frequency trading instructions in servers, with CMB fluctuations from billions of years ago—low frequency firmness, high frequency trembling, medium frequency lingering.
Mozi's palm slid over the curve of her scapula, like a gentle test of boundary conditions: if fingertip pressure increased 0.1 Newtons here, how much would her breathing frequency increase? If lips moved 3 centimeters along the carotid artery, how many percentage points would her heartbeat amplitude amplify? With the most rigorous experimental attitude, he solved a fluid-structure interaction problem not yet named; and she with every involuntary tremor, gifted him sets of scorching experimental data.
When clothes peeled off like peeling away annotations layer by layer, revealing naked, firewall-less interfaces, they finally began running that set of protocols privately debugged for months but delayed in going online. No parity bits, no retransmission mechanisms, only raw and fragile plaintext, transmitted at light speed between skin and skin. Every touch was an ACK, every sigh was a SYN, flood-like data packets collided back and forth between two points, pressing latency to sub-millisecond levels, dropping packet loss rate to zero.
Yue'er in trance saw a new equation being written in real-time in her body: left side was Mozi's temperature gradient, right side was the Laplace operator of her heartbeat, boundary conditions were the pressure distribution her fingertips left on his spine. The solution of the equation was not numerical, but a continuous, non-differentiable, yet incomparably smooth moan. She suddenly realized, perhaps "smooth solutions" do not exist in Euclidean space, but exist in the chaotic orbit in high-dimensional phase space jointly constituted by the two of them at this moment—it may never be accepted by journals, yet is notarized by the universe at this moment.
Mozi said in the lightest voice behind her ear: "If turbulence is the inevitability of information overload, then let us overload each other." That sentence was like a hidden SQL injection, instantly piercing all her firewalls still trying to maintain rationality. She felt the data lake in her body begin to burst its banks, every cell overflowing into binary flood, pouring into his port along the interface surface of the two.
Outside the window, three o'clock in the morning city lights were like a distant star map, together with the still rolling curves on the holographic screen above their heads, becoming the silent background of this private experiment. No one knew, on cosmic scales, whether another CMB fluctuation was quietly climbing; no one knew, on the other side of the Earth, whether another stock was flash crashing due to the same perturbation. But at this moment, in this secret room wrapped by blue fluorescence, only two lonely and outstanding variables, were using each other's bodies to solve a first-order partial differential equation about existence, about smoothness, about eternity.
When climax arrived like a singularity, time briefly lost differentiability. Yue'er heard herself squeeze out a howl from deep in her throat that could not be compiled by any language, that sound was like a hash value broadcast to the entire universe: it contained no plaintext, yet could be instantly verified by any soul that had experienced the same turbulence. Mozi held her with all his strength, as if to press all his mass into her four-dimensional momentum, letting two originally independent worldlines coincide in this segment, then together jump to some not yet named, higher symmetry energy level.
After the storm, they were like two paper tapes washed ashore, quietly lying in the shadows cast by server racks. Sweat evaporated on skin, carrying away heat, also carrying away the last defense. Yue'er buried her face in his shoulder socket, her breath full of the mixed taste of ionized air and metal heat sinks. She suddenly laughed softly: "If the Millennium Prize Problem reviewers knew we were solving smoothness this way, would they be so angry as to revoke our mathematics licenses?"
Mozi rubbed her forehead corner with the tip of his nose, his voice hoarse yet carrying post-satisfaction laziness: "Then let them revoke them. The universe won't care about a license, it only cares whether the solution exists."
On the holographic screen, the three rivers still surged, yet at a certain instant simultaneously showed an extremely subtle synchronous tremor—like a distant galaxy's gravitational wave passing through, like a global neural network's collective discharge, also like a gentle and crazy footnote written into CMB, written into K-lines, written into meridian conductivity, about how two tiny humans used the most primitive way to verify each other's existence.