Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...

Population ecology is the study of how populations — of plants, animals, and other organisms — change over time and space and interact with their environment. Populations are groups of organisms of ...

The census is conducted every 10 years in the United States, but did you know it’s required by the Constitution? In Article I, Section 2, the Constitution says Congress must count the residents of the ...

In the simple map above lies a stark spatial imbalance: Half the people in the world cram into just one percent of the Earth’s surface (in yellow), and the other half sprawl across the remaining 99 ...

The United States is growing older. The median age in this country is rising, according to the Census Bureau. The median is now almost 39 years old, meaning that half the population is below that age ...