Population density (often abbreviated PD) is a compound measure that tells us roughly how many people live in an area of known size. It is commonly used to compare how 'built-up' two areas are.

This article was originally published with the title “ Population Density and Social Pathology ” in Scientific American Magazine Vol. 206 No. 2 (February 1962), p. 139 doi:10.1038 ...

A new study found that the warming climate may be partially responsible for Boston’s increasing rat population.

Because of this, exponential growth may apply to populations establishing new environments, during transient, favorable conditions, and by populations with low initial population density.

Other small urban regions, like Monaco, Singapore and Vatican City, also ranked highly in population density. While these ...

Converting existing office buildings to residences won’t be enough to stop the “urban doom loop,” because apartment buildings ...

"And then we found this positive effect of human population density on survival time. Both of those things are unexpected because we usually associate human activity with detrimental effects on ...