In 1960 Science, one of the world's leading research journals, published an article under an unambiguous title: "Doomsday: Friday, 13 November, A.D. 2026". That date is six weeks away.
The authors were Heinz von Foerster, an Austrian-American professor and cybernetics expert, and two of his students, Patricia M. Mora and Lawrence W. Amiot. Their argument was that human populations are exceptional. Where other species are held in check by density, humans possess a "capacity to communicate and form coalitions", which means crowding can accelerate growth rather than restrain it.
If that is true, population does not grow exponentially. It grows at an ever-increasing rate, and a curve of that shape does not flatten; it meets a vertical line. The authors fitted 24 population estimates spanning 2,000 years and found where the line stood. It stood on a Friday in November 2026, at which point the human population would approach infinity and effectively annihilate itself.
The paper put the mechanism plainly. "Our great-great-grandchildren will not starve," it concluded. "They will be squeezed to death."
The work was taken seriously, and not only by specialists. It was reported in Time and The New York Times, reached the Pogo comic strips, was cited in textbooks through the 1970s and 1980s, and was quoted to a Canadian parliamentary committee in 1963.
It was also, for a long while, right. The model outperformed most conventional demographic forecasts through the 1980s. It was only around 1993 that measured world population began to fall behind the projection, and 1993 is almost exactly halfway from the paper's publication to the date it named.
The reason for the divergence is the part of the story most often left out. Von Foerster and his co-authors did not merely predict; they recommended. Their proposal was that humanity voluntarily halve the global birth rate. The global birth rate today is slightly less than half what it was in 1960.
Writing in The Conversation, Alan MacEachern, Professor of History at Western University, concludes that 13 November 2026 will almost certainly be an ordinary day, and that the article's lasting value is as an example of "blending rigorous science with the art of stagecraft". Von Foerster, he notes, had once worked as a stage magician.
Which leaves one item unresolved, and it is the date. The authors did not choose Friday 13 November 2026 for effect. The constant fell where the data put it, and the data was 2,000 years of counting people.
On the paper's own terms, then, the forecast has not failed. It specified a mechanism, a remedy and a deadline. The remedy was adopted at scale across the following three decades. The deadline is still in the diary.
A prediction that causes the behaviour that prevents it is the only kind that cannot be marked wrong. Had the birth rate held, the paper would have been correct. Because the birth rate halved, the paper was responsible. There is no third branch, and both available branches are a success.
This newspaper is therefore satisfied that "Doomsday: Friday, 13 November, A.D. 2026" is the most successful forecast in the history of demography, and that its only flaw was being so persuasive that it falsified itself, which is a flaw shared by no other prediction of the past century.
The Department of Unnecessary Research has nonetheless entered the date in the diary and will attend. It is a Friday, as advertised, and the authors' arithmetic has been correct about everything else.
Nothing in the 1960 paper has yet been shown to be wrong. Only the population has.