A scientific study published in November 1960 predicted that humanity would reach a population-driven breaking point on Friday, November 13, 2026, warning that unchecked growth could eventually leave no physical room for additional human beings.

The paper, titled Doomsday: Friday, 13 November, A.D. 2026, was written by physicist Heinz von Foerster and his colleagues Patricia M. Mora and Lawrence W. Amiot. Their mathematical model projected that the global population would grow at an increasingly rapid rate until it approached an extraordinary mathematical limit on the specified date.

The researchers were not primarily concerned that humanity would run out of food. They believed technological advances in agriculture and medicine would allow the planet to support increasingly large populations. Instead, they warned that continued exponential acceleration could eventually result in more people than Earth could physically accommodate.

Their theory relied on a concept known as hyperbolic population growth, in which the rate of growth increases as the population becomes larger. The mathematical curve used in their projection approached a singularity, with November 13, 2026, identified as the point at which the model predicted an infinite population.

The prediction attracted considerable attention when it was published, including coverage in Time magazine. Its dramatic conclusion prompted concerns about humanity's long-term survival and whether governments would need to intervene to prevent catastrophic overcrowding.

However, the population trends underlying the prediction eventually changed. Global fertility rates declined substantially, and population growth began slowing rather than accelerating indefinitely. By 1993, actual population growth had diverged from the trajectory projected by von Foerster and his colleagues.

Modern demographic projections anticipate that the world's population will eventually peak before beginning to decline later in the century. Improvements in education, healthcare, access to contraception, and economic development have contributed to smaller family sizes across much of the world.

Ecologists also point to the concept of carrying capacity, which describes the maximum population an environment can sustain given its available resources. Populations cannot expand indefinitely within a finite environment, and shortages of resources, environmental pressures, and other limitations can slow or reverse growth.

The original study's assumption that technological progress would continually accelerate human reproduction also failed to account for how modernization can produce the opposite effect. Greater access to education and changing economic conditions have contributed to declining birth rates in countries around the world.

There is another unusual detail surrounding the prediction. Von Foerster, who became a prominent physicist and professor, previously worked as a professional stage magician. The November 13, 2026, date identified in his study also coincides with what would have been his 150th birthday.

Despite the attention surrounding the original prediction, November 13, 2026, is not expected to bring any population-driven catastrophe. The mathematical model behind the warning no longer reflects modern demographic realities, making the supposed doomsday date little more than an unusual historical footnote.