In January 2025 alone, the U.S. is expected to see one birth every 9.0 seconds and one death every 9.4 seconds, according to ...

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 ...

Genetic variation describes naturally occurring genetic differences among individuals of the same species. This variation permits flexibility and survival of a population in the face of changing ...

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.

The database contains data on four key indicators: the distribution of the population by marital status, the proportion currently married, the proportion ever married, and the singulate mean age ...

“Without continued net inflows of immigrants, the U.S. working-age population will shrink over ... workers at the top and bottom of the skill distribution. International migration is the only ...