Nigeria, Africa’s most populous nation, is now giving birth to more babies each year than all of Europe plus Russia combined, a milestone that reflects profound global demographic change.

A new visual by World Visualized highlights the countries with the highest average testosterone levels, measured in nanograms per deciliter (ng/dl).

Across Europe, birth rates tell a changing story. According to new findings from the Pew Research Center, Muslim families are having more children on average than non-Muslims, a pattern that is reshaping the region’s population dynamics.

Across much of the world, people are having fewer children than ever before. A new visual from World Visualised, using World Bank data, shows a striking pattern: between 2000 and 2023, fertility rates in the ten largest countries have fallen sharply, and in five of them, they’ve dropped below the replacement level of 2.1 births per woman.

World Visualized’s graphic charting the median age of the global population from 1950 to 2025 shows a steady rise: from around 22 years in 1950 to more than 30 years in 2025. The pattern highlights how advancements in healthcare and education, combined with declining fertility rates, are transforming societies worldwide.