## Featured:

# “Critically Inflammatory”

## A forrest fire model

This explorable illustrates, as a representative of a broad range of dynamic phenomena,
a simple model for the spatial spread of forest fires and the dynamic patterns they generate. In the model
two antagonistic processes interplay, the * reproductive growth of vegetation* that continously covers the landscape with trees susceptible to fires and

*that spread across areas of dense vegetation.*

**spontaneously seeded (lightning strikes) forest fires**# “Echo Chambers”

## A model for opinion dynamics

This explorable illustrates a network model that captures how opinion dynamics might work in a population and how clusters of uniform opinion might naturally emerge from an initially random system. The model is a variant of a model introduced by
P. Holme and M. Newman in a 2006 paper: *Nonequilibrium phase transition in the coevolution of networks and opinions*.

## Most recent:

# “Thrilling Milling Schelling Herings”

## Swarming behavior of animals that seek their kin

This explorables is a **combination of two models**, one that explains the emergence of dynamic patterns and **collective behavior in schools of fish or flocks of birds**, the second, the **Schelling model**, captures the geographic segregation of populations of different kinds of individuals. When these two models are combined, a great variety of beautiful dynamic swarming patterns can be generated. These patterns show traces of the generic swarming states like * "milling"* and segregation effects within these dynamic states.

# “Repliselmut”

## Yet another Complexity Explorable on evolution

This explorable illustrates how *variation* and *selection* in a population of *replicating* organisms naturally leads to a gradual increase in the population's overall fitness. The explorable simulates a system that is captured (to some extent) by the **Replicator-Mutator Equation** which is both, a generalization of the famous **Replicator Equation** and the **Quasispecies Equation**.

# “T. Schelling plays Go”

## The Schelling model

This explorable illustrates the dynamics of the **Schelling model** named after economist and Nobel laureate Thomas Schelling (1921-2016). Although this model has been applied in different contexts, it is best known for its ability to capture geographical ethnic segregation of human populations and cities based on very simple principles.