Friday, November 13, 2026, has an unusual place in scientific history. It is the date named in a 1960 paper that explored where accelerating population growth might lead. But describing the study as proof that the world will end on that day leaves out its crucial condition: the prediction depended on past growth patterns continuing.

Published in Science on November 4, 1960, the paper was written by Heinz von Foerster, Patricia M. Mora, and Lawrence W. Amiot. Its striking title, “Doomsday: Friday, 13 November, A.D. 2026,” helped turn a mathematical population model into an enduring apocalypse story.

The researchers examined historical population estimates and developed a curve describing increasingly rapid growth. Extending that curve forward produced a startling result: the calculated population would approach infinity in 2026. This is a mathematical singularity—a point where a model stops producing a finite value. It cannot represent an actual number of people living on Earth.

The distinction matters. A calculation that reaches infinity does not establish a date for humanity’s extinction. It shows that the pattern described by the equation cannot continue indefinitely in the real world.

Population trends have since taken a different direction. The United Nations’ 2024 population assessment describes a global shift toward longer lives and smaller families. It projects that the world’s population will rise from approximately 8.2 billion in 2024 to around 10.3 billion in the mid-2080s, before easing to roughly 10.2 billion by 2100. These are projections with uncertainty, but they describe a very different future from unlimited acceleration.

The old prediction’s failure has also received fresh scientific attention. An October 2026 commentary in Science, titled “Demographic ‘doomsday’ misses the mark,” notes that humanity is nowhere near the population singularity anticipated by the original paper.

None of this removes the need to address global risks. The Bulletin of the Atomic Scientists set its separate Doomsday Clock to 85 seconds before midnight in January 2026, citing concerns including nuclear weapons, climate change and emerging technologies. That clock is a symbolic assessment of danger, rather than a countdown to a scheduled catastrophe.

The lasting value of the 1960 study lies in the question it raises about forecasting: how long can yesterday’s trends reasonably describe tomorrow? An equation can fit historical observations and still become unreliable as circumstances change.

November 13, therefore, marks an opportunity to revisit a memorable scientific prediction. The population model offers no sound basis for expecting the world to end on that date.