## Advective collisions

Small particles advected in a fluid can collide (and therefore aggregate) due to the stretching or shearing of fluid elements.

## Evolutionary branching

Evolutionary branching is analysed in a stochastic, individual-based population model.

## Random-matrix theory

Eigenvector statistics in non-Hermitian random-matrix ensembles.

## Caustics

Networks of caustics can occur in the distribution of particles suspended in a randomly moving gas.

## Gene geneaolgies

We consider neutral evolution of a large population subject to changes in its population size.

## Rheoscopic swirls

Rheoscopic swirls. Patterns of singularities in rheoscopic fluids.

## Clustering in flows

Clustering of inertial particles suspended in turbulent flows.

## Metaplectics

A new Hilbert-space representation of symplectic transformations.

## Staggered ladders

There are only few physically significant systems with ladder spectra (exactly evenly spaced energy levels).

## Metapopulations

We analyse metapopulation dynamics in terms of an individual-based, stochastic model of a finite metapopulation.

## Tumbling of microrods

We describe a microfluidic device for studying the orientational dynamics of microrods.

## DNA in nanochannels

We study how the orientational correlations of DNA confined to nanochannels depend on the

channel diameter D by means of Monte Carlo simulations and a mean-field theory.

## Multiple paternity

What is the minimum number of sires of a large brood?