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Albert Bartlett was an American physics professor at the University of Colorado Boulder who spent 36 years delivering a lecture titled "Arithmetic, Population and Energy" — a lecture he gave over 1,742 times across four decades and which became one of the most-watched science presentations in history. He devoted his professional life to a single idea: that human beings are constitutionally unable to intuitively grasp exponential growth, and that this failure has consequences for everything from population to energy to environmental sustainability. He was not a pessimist. He was a mathematician who thought the truth mattered enough to repeat it 1,742 times.

World Population Day exists because the Earth's population — which took all of human history to reach one billion in 1804 — added the next billion in just 123 years, then 33, then 14. We now add a billion people every 12 years. Bartlett's quote names the root of the problem: not greed or politics but a cognitive failure written into the human nervous system. Exponential growth feels slow at the start and then, suddenly, it doesn't. Wimbledon's finals — where the best of the best, narrowed through a week of exponentially demanding competition, meet in the final two — offer a different view of the same mathematics: the higher the level, the faster the attrition. Understanding the curve changes everything.