November 13, 2026, has an unusual place in scientific history. More than six decades ago, researchers identified it as the point at which their mathematical model of human population growth reached infinity.

That startling result became the basis of a paper published in Science in 1960 by Heinz von Foerster, Patricia M. Mora and Lawrence W. Amiot. But the date is not evidence of an approaching apocalypse. It illustrates the danger of assuming that a historical trend can continue indefinitely.

The researchers examined 24 estimates of the world’s population spanning nearly 2,000 years. Their argument focused on humanity’s ability to cooperate: larger populations could share knowledge, improve living conditions, and overcome environmental obstacles, potentially enabling even faster growth.

Their model described growth that accelerated beyond an ordinary exponential pattern. Extending that curve into the future produced a point at which the calculated population became infinite—the dramatic “doomsday” of the paper’s title.

However, infinity in an equation is not a physical forecast that the planet will suddenly fill with people. It indicates that the assumed pattern cannot continue unchanged. Even the apparent precision of the date needs context: the researchers reported uncertainty of roughly 5.5 years around their fitted endpoint.

Human population trends have since followed a different course. The United Nations describes the demographic transition as a historical shift toward longer lives and smaller families. Those changing conditions are central to understanding why simply extending an earlier growth curve can produce misleading results.

According to the UN’s World Population Prospects 2024, the global population is projected to rise from 8.2 billion in 2024 to approximately 10.3 billion in the mid-2080s. It would then gradually decline to around 10.2 billion by 2100. These figures are projections, rather than guaranteed outcomes, but they describe a future very different from unlimited growth.

The global picture also hides considerable variation. Some countries already face population decline, while others are expected to grow for decades. In more than half of countries and areas, fertility is below 2.1 births per woman—the approximate level needed to sustain population size over the long term without migration.

These differences create practical questions about how societies prepare for changing populations. Governments need to plan for shifts in the number of residents, their ages, and where they live. A single worldwide total cannot capture all those needs.

The lasting value of the 1960 paper is the question it leaves behind: how far can yesterday’s patterns guide tomorrow’s expectations? November 13 makes an attention-grabbing headline, but the more useful story is how human behavior can change the future that a mathematical model appears to predict.