The Human Footprint Index
The Human Footprint Index (HF) expresses as a percentage the relative hum an influence in each terrestrial biome. HF values
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World city populations (1950 – 2030)
This map visualizes the radical transformation that has occurred across the globe in the last 60 years, from a 30%
Read MoreRoads to Rome
The proverb “All roads lead to Rome” is rooted in the historical and cultural significance of ancient Rome. The saying reflects the fact that during the peak of the Roman Empire, the city of Rome served as the center of the empire’s vast road network, known as the Roman road system.
Read MoreHow Americans choose Christmas trees
Each state has a distinctive taste in Christmas trees. Tennessee, Florida, and West Virginia are the top spenders for artificial
Read MoreHair color of world leaders
Blondes thrive in northern Europe and baldness prospers in Africa. There’s a sweep of grey hair around the middle of
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