In his spare time, Shen Cong had always enjoyed books and documentaries about biology.
Some time back he’d watched a documentary on the Chengjiang Biota — research footage combined with visual reconstruction of the Cambrian Explosion, that extraordinary 20-million-year window between 542 and 530 million years ago when multicellular life diversified in an eruption of forms unlike anything before or since.
The Chengjiang Biota had posed serious challenges to Darwinian gradualism. Many biologists argued that classical evolutionary theory wasn’t always sufficient. Religion had waded in as well, with various strands of creationism seizing on the apparent sudden appearance of body plans as evidence of divine intervention.
But as understanding of geology and paleontology deepened, the picture clarified. Twenty million years was not instantaneous — and the conditions of the Cambrian had been extraordinary: rising temperatures and biological resurgence, sufficient oxygen enabling ozone formation, frequent volcanism enriching ocean nutrients, phosphate deposits forming, the emergence of biological sexes for the first time. All of these converging factors had created the conditions for explosion.
The cumulative weight of evidence didn’t refute Darwin — it extended him. In recognition of this, the Chinese scientific community had revised its standard translation of “evolution” on July 1st, 2019, the thirty-fifth anniversary of the Chengjiang discovery: from 进化论 — literally “theory of advancement” — to the more precise 演化论 — “theory of transformation.” A subtle but meaningful distinction: evolution wasn’t necessarily progress. It was change.
Since Darwin’s On the Origin of Species in 1859, the question of where life came from had become a serious philosophical and scientific project. Over a century and a half of research had built and refined the framework. It had produced, among other things, the theory of punctuated equilibrium:
Evolution — transformation — is not always gradual. It is a process in which gradual change and sudden leaps coexist.
He’d thought of all this because of what he’d found inside the Old Pearl Mussel.
He had dissected many Pearl Mussels — extracted pearls, peeled away Activity core shells. Through all of that, one thing had always been consistent: a clear, distinct boundary between shell and flesh. Activity cores, within a biological organism, were relatively independent structures with distinct properties. Because they typically derived from intact bones undergoing metallic transformation, the boundary was sharp and clean — easy to separate.
In the Old Pearl Mussel, that boundary was blurring.
The flesh immediately adjacent to the shell had begun its own metallic transformation. It had fused with the shell wall. It couldn’t be cleanly separated anymore.
The Activity core was spreading. Bleeding into the surrounding tissue. The flesh at the contact zone was transforming, and further out — in tissue with no direct contact — subtler signs of the same process were beginning.
Like cancer cells metastasizing. The whole organism changing.
He cut away a small sample of the transforming flesh and examined it. Under his perception, the sample registered as something between flesh and core — Activity dissipation slightly reduced, and when he pushed Activity into it, a faint sharpening response activated. It was beginning to behave like an Activity core.
What was strange was that it hadn’t hardened. It retained the same softness as ordinary mussel flesh.
But when he cut it, the blade met resistance — the particular drag of cutting metal.
“Soft as muscle. Hard as metal. Both at once?”
He stood there for a moment, not quite sure how to process what he was seeing. His thoughts were a tangle.
He’d imagined the Lv1 era many times. He’d even entertained the fantasy of organisms becoming entirely metallic — creatures of solid metal walking the earth. But faced with actual evidence of that transition beginning, he felt something closer to unease than excitement.
The Old Pearl Mussel’s Activity core was propagating into its surrounding tissue. The whole organism was beginning to transform at a cellular level. An organic life form, transitioning toward inorganic metal.
Metal life.
Is this the direction Lv1 evolution takes?
“Plant bark and leaf veins undergoing metallic transformation. Animal Activity cores undergoing metallic transformation. Now body tissue itself beginning to transform.” He worked through it. “Mutants would undergo this too. But what about iron people? Why did I bond with a metal machine — become one organism with it? Is there a day coming when I become a true metal ‘iron person’ in the most literal sense?”
No answers. He removed the hydraulic jacks, let the Old Pearl Mussel close its shell, and brought the tissue sample back to Great Vajra.
He set it on the lab table, pulled up a chair, and sat with his thoughts for a while.
The first place his mind went was punctuated equilibrium.
The Cambrian Explosion. Twenty million years during which life moved from deep ocean to shallow sea, diversifying into countless new forms — some of the strongest evidence ever found for the theory of sudden leaps punctuating long periods of stability. Classical Darwinism described gradual accumulation; punctuated equilibrium described long stasis interrupted by rapid transformation, which was why the fossil record had gaps.
And right now, Earth is in one of those rapid transformations.
A world-ending meteor shower had brought Activity. Activity had destabilized metal — corroding it, or activating it. Activity had also altered the fundamental composition of biological organisms, forging links between organic life and metal, pulling living things gradually toward metallic form.
The only known Lv1 organism — the Old Pearl Mussel — showed a fully metallic Activity core now beginning to propagate into surrounding tissue.
He thought about the Golden Jiao’s horn protrusions. The Swiftclaw Leopard’s tail whip. The horns had shown muscle tissue transitioning toward metal. The tail whip had shown both bone and external skin and flesh completing full metallic transformation. Both could be understood as Activity cores spreading into surrounding tissue — early-stage versions of exactly what the Old Pearl Mussel was now showing at full expression.
“Is this metallic transformation the continuation of evolution toward a new life form — or is it pathological degeneration toward extinction?”
He couldn’t determine the answer. He couldn’t even picture what a fully metal organism would look like in practice, or how it would continue to function.
But he couldn’t rule it out either.
Great Vajra had come alive. The failed metal life-form had come alive. If the extension capacity of metallic organisms continued to develop, self-directed metallic life was not obviously impossible.
The old order had been demolished. What was rising in its place resembled nothing so much as another Cambrian Explosion — new categories of life appearing rapidly, in abundance and variety. Evolved beasts, evolved trees, endlessly proliferating. Some evolving to dominance at the top of the food chain. Some evolving in directions too marginal to survive, becoming prey. Some evolving in ways that didn’t work at all — like the Vicious Cat — and being eliminated. And ordinary biological organisms, unevolved, gradually disappearing.
A reshuffling. The old being erased. Something entirely new being written.
Life was undergoing a leap.
Zhang Kan had said it: the future would belong to Xiao Li Du and those like them — the fully new. Everyone alive now, Shen Cong included, was an artifact of the old era. Ancient stock. Perhaps eventually they would be eliminated entirely, and become material for future archaeologists to study.
Shen Cong was starting to believe it.
“But what form do iron people represent in all of this? Between iron people and mutants — which one is the Yunnanozoon?”
(End of Chapter 210)