Around 21,000 years ago you could walk from Britain to France without crossing water. The North Sea floor was dry land, because so much water was locked up in ice sheets that coastlines everywhere looked different. The Sahara during this period was more barren than it is today, not less, and the Amazon existed as two separate forest fragments.
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Canada’s birth rate dropped below replacement in 1971. Colombia crossed the same line in 2007 — the same year as the US. Guatemala held on until 2023. Across the entire Americas, only Haiti, Guyana, French Guiana, and Honduras are still above that threshold today.
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The Caspian Sea is the largest lake on Earth at 386,000 km² (149,000 mi²). Lake Paratethys, which existed twelve million years ago between the Alps and Kazakhstan, covered 2.8 million km², more than seven times that size. It held more water than every modern lake combined, had its own miniature whale species, and eventually broke apart into the Caspian, the Black Sea, and the Aral Sea.
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Some regions of Asia hold dozens of completely unrelated languages within a few hundred kilometers. Others stretch for thousands of kilometers on a single tongue. The difference almost perfectly follows the mountain belt.
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Eight billion people share the planet today, but that number has never moved in a straight line. Plagues erased tens of millions within a few years. Colonization wiped out nearly 90% of the Americas in a single century. The Industrial Revolution nearly doubled global numbers in just 100 years. A series of population cartograms maps all of this from 10,000 BCE to 2023.
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In 1969 the entire internet was four university labs on the US west coast, linked by four connections. A 21-year-old programmer made the first transmission, two letters got through, and the whole system crashed.
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Europe’s religious map is mostly Abrahamic. Christianity, Islam, and Judaism between them account for the vast majority of believers across the continent. Filter those three out and what’s left includes Tibetan Buddhism in Russia, reconstructed Norse paganism in Iceland, ancient fire worship in Azerbaijan, and 21,539 registered Jediists in Czechia.
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For most of human history, having six or seven children was survival arithmetic.
Today, in more than half the world’s countries, the average is below 2.1 — and
some are at levels that would cut their populations in half within two generations.
Canada is the second largest country in the world but has fewer people than California and Texas combined. It runs one of the most active immigration programs anywhere — and between 2015 and 2025, nearly 4 million people took it up on that offer.
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Most people associate the colonial age in the Americas with England, France, or Spain. But Scotland had its own ambitious plans stretched across five locations from the Galápagos Islands to the jungles of Panama.
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