COMPLEXITY

When British scientist and novelist C.P. Snow described the sciences and humanities as “two cultures” in 1959, it wasn’t a statement of what could or should be, but a lament over the sorry state of western society’s fractured intellectual life. Over sixty years later the costs of this fragmentation are even more pronounced and dangerous. But advances in computing now make it possible for historian...

Can you write a novel using only nouns? Well, maybe…but it won’t be very good, nor easy, nor will it tell a story. Verbs link events, allow for narrative, communicate becoming. So why, in telling stories of our economic lives, have people settled into using algebraic theory ill-suited to the task of capturing the fundamentally uncertain, open and evolving processes of innovation and exchange? Welc...

What is the economy?  People used to tell stories about the exchange of goods and services in terms of flows and processes — but over the last few hundred years, economic theory veered toward measuring discrete amounts of objects.  Why?  The change has less to do with the objective nature of economies and more to do with what tools theorists had available.  And scientific instruments — be they mat...

Whether in an ecosystem, an economy, a jazz ensemble, or a lone scholar thinking through a problem, critical transitions — breakdowns and breakthroughs — appear to follow universal patterns. Creative leaps that take place in how mathematicians “think out loud” with body, chalk, and board look much like changes in the movement through “music-space” traced by groups of improvisers. Society itself ap...

We are all investors: we all make choices, all the time, about our allocation of time, calories, attention… Even our bodies, our behavior and anatomy, represent investment in specific strategies for navigating an evolving world. And yet most people treat the world of finance as if it is somehow separate from the rest of life — including people who design the tools of finance, or who come up with e...

The popular conception of ants is that “anatomy is destiny”: an ant’s body type determines its role in the colony, for once and ever. But this is not the case; rather than forming rigid castes, ants act like a distributed computer in which tasks are re-allocated as the situation changes. “Division of labor” implies a constant “assembly line” environment, not fluid adaptation to evolving conditions...

Seventy thousand years ago, humans migrated on foot across the ancient continent of Sahul — the landmass that has since split up into  Australia and New Guinea. Mapping the journeys of these ancient voyagers is no small task: previous efforts to understand prehistoric migrations relied on coarse estimates based on genomic studies or on spotty records of recovered artifacts. Now, progress in the fi...

This week we conclude our two-part discussion with ecologist Mark Ritchie of Syracuse University on how he and his SFI collaborators are starting to rethink the intersections of thermodynamics and biology to better fit our scientific models to the patterns we observe in nature. Most of what we know about the enzymatic processes of plant and animal metabolisms comes from test tube experiments, not...

Deep inside your cells, the chemistry of life is hard at work to make the raw materials and channel the energy required for growth, maintenance, and reproduction. Few systems are as intricate or as mysterious. For this reason, how a cell does what it does remains a frontier for research — and, consequently, theory often grows unchecked by solid data. Most of what we know about the enzymatic proces...

The 19th Century saw many transformations: the origins of ecology and modern climatology, new unifying theories of the living world, the first Big Science projects, revolutions in the Spanish colonies, new information systems for the storage and representation of data… Many of these can be traced back to the influence of one singular explorer, Alexander von Humboldt. Humboldt was one of the last t...

When you hear the word “nature,” what comes to mind? Chances are, if you are listening to this in the 21st Century, the image is one of a vast, interconnected, living network — one in which you and your fellow human beings play a complicated part. And yet, this is a relatively recent way of thinking for the modern West. It takes a special kind of thinker — and a special kind of life — to find and...

Complexity is all around us: in the paths we walk through pathless woods, the strategies we use to park our cars, the dynamics of an elevator as it cycles up and down a building. Zoom out far enough and the phenomena of everyday existence start revealing hidden links, suggesting underlying universal patterns. At great theoretic heights, it all yields to statistical analysis: winning streaks and tr...

“More than the sum of its parts” is practically the slogan of systems thinking. One canonical example is a beehive: individually, a honeybee is not that clever, but together they can function like shapeshifting metamaterials or mesh networks — some of humankind’s most sophisticated innovations. Emergent collective behavior is common in the insect world — and not just among superstar collaborators...

Human relationships are often described in the language of “chemistry” — does that make the beliefs and attitudes of individuals a kind of “physics”? It is, at least, a fascinating avenue of inquiry. In particular, the field of statistical mechanics offers potent tools for understanding how exactly people form their views and change their minds. From this perspective, everyone is a dynamic network...

Once upon a time at UC Santa Cruz , a group of renegade grad students started mixing physics with math and computers, determined to discover underlying patterns in the seeming-randomness of systems like the weather and roulette. Their research led to major insights in the emerging field of chaos theory, and eventually to the new discipline of complexity economics — which brings models from ecology...

In the 21st Century, science is a team sport played by humans and computers, both. Social science in particular is in the midst of a transition from the qualitative study of small groups of people to the quantitative and computer-aided study of enormous data sets created by the interactions of machines and people. In this new ecology, wanting AI to act human makes no sense, but growing “alien” int...

Art history is a lot like archaeology — we here in the present day get artifacts and records, but the gaps between them are enormous, and the questions that they beg loom large. Historians need to be able to investigate and interpret, to unpack the meanings and the methods of a given work of art — but even for the best, the act of reconstruction is a trying test. Can we program computers to deciph...

The consequence of living in a complex world: one tiny tweak can lead to massive transformation. Set the stage a slightly different way, and the entire play might unfold differently. This path-dependency shows up in both the science fiction premise and the hypothesis of scientific research: What can we learn about the hidden order of our cosmos by adjusting just a single variable? Welcome to COMPL...

Most maps of the world render landscapes in 2D — yet wherever we observe ecosystems, they stratify into a third dimension. The same geometries that describe the dizzying diversity of species in the canopies of forests also govern life in other  living systems, from the oceans to the linings of our mouths. Behind the many forms, a hidden order shapes how organisms live in and on each other — and th...

It’s tempting to believe that people can outsource decisions to machines — that algorithms are objective, and it’s easier and fairer to dump the burden on them. But convenience conceals the complicated truth: when lives are made or broken by AI, we need transparency about the way we ask computers questions, and we need to understand what kinds of problems they’re not suited for. Sometimes we may b...

COVID-19 hasn’t just disrupted the “normal” of everyone’s social practices in what we take for granted as “daily life.” The pandemic has also, more granularly, changed the way scientists research and publish; it has changed the way science interfaces with institutions as varied as local governments and cell phone companies; it has changed the way we host and produce this podcast. This episode, for...

Matter, energy, and information: the holy trinity of physics. Understanding the relations between these measures of our world are one of the big questions of complex systems science. The laws of thermodynamics tell us that entropy (loosely but somewhat inaccurately speaking, “disorder”) increases in any closed material system. But at the same time living systems constantly pump out entropy, thereb...

"There are decades where nothing happens; and there are weeks where decades happen.” – Vladimir Ilyich Lenin When human beings saw the first pictures of the Earth from space, the impact was transformative. New instruments for taking in new vistas, for understanding our relationships and contexts at a different scale, have in some ways defined the history of not just science but the evolution of in...

The modern world has a way of distancing itself from everything that came before it…and yet the evidence from archaeology supports a different story. While industrial societies tend to praise markets and advanced technologies as the main drivers of the last few centuries of change, a careful study of civilizations as distinct as Ancient Rome, Peru, and Central Mexico reveals an underlying uniformi...

Organisms aren’t the only products of the evolutionary process. Cultural products such as writing, art, and music also undergo change over time, subject to both the constraints of the physical environment and the psychologies of those who make them. In recent years, the study of cultural evolution has exploded with new insights — revelations into the dynamics of how culture is transmitted, how it...