In a recent work on the wave of advance of a beneficial technology and associated hitchhiking of cultural and biological traits, we simulated the advance of neolithic agriculture into Europe. That model embraced geographical variation of land fertility and human mobility, conversion of...

For animals that forage underground, the success with which food items are located may be closely related to burrow architecture. Fractal dimension, which describes how a burrow explores the surrounding area in a way that is independent of burrow length, is an obvious choice for a single metric...

We present a two-dimensional model for tumor growth and morphology. The model contemplates, among other biological processes, cellular adhesion and the rigidity of the tissue embedding a tumor. We find that for some values of adhesion and rigidity, these tumors are fractals with dimensions...