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Can two people restart humanity? We analyze the population genetics and math behind repopulating Earth from a single pair. Everyone on Earth vanishes except you and one stranger. Could the two of you actually repopulate the planet, or would genetics guarantee extinction? In this video, we break down the math and biology behind restarting civilization from scratch. From how fast a population could reach 8 billion to the genetic bottleneck that wrecked royal dynasties, here is what science says about starting over with just two people. Restarting humanity with only two people is a popular thought experiment, but can population genetics actually support it? We break down the math behind a potential recovery and the severe biological risks that accompany a extreme population bottleneck. By looking at historical examples like the black robin and the genetic history of royal dynasties, we explain why the path to a sustainable future is far more complex than simple arithmetic. This analysis examines how inheritance patterns and lethal mutations influence long-term survival. Understanding these constraints helps clarify why maintaining genetic diversity remains the primary hurdle for any species facing near-extinction. This thought experiment sounds simple, but the biological reality is far more complex. While basic arithmetic suggests a rapid recovery, we examine why a severe population bottleneck creates insurmountable hurdles. By looking at the history of royal dynasties and the survival of the black robin, we explain how lethal mutations and inbreeding depression typically lead to extinction rather than a new civilization. Understanding these evolutionary constraints reveals why maintaining genetic diversity is the primary requirement for any species facing near-collapse. We break down why the minimum number of people needed to survive is significantly higher than two, demonstrating the limits of reproduction math in a real-world scenario. Subscribe for weekly science engineering breakdowns, and let us know: if you were the last person on Earth, which friend or expert would you want by your side? 0:00 The Last Two Humans on Earth 1:00 The Mathematical Speed of Population Growth 1:39 The Hidden Dangers in Our DNA 4:00 Lessons From the Brink of Extinction If you were the last person on Earth, which friend or expert would you want by your side? Drop your answer in the comments below! 🔔 Subscribe to Paper Spark Stories for more deep dives into science, history, and wild hypothetical scenarios. #Humanity #Science #Biology #ThoughtExperiment #Evolution Sources - Eaton & Mayer (1953), The social biology of very high fertility among the Hutterites, Human Biology 25(3) - Gao et al. (2015), An estimate of the average number of recessive lethal mutations carried by humans, Genetics: https://pmc.ncbi.nlm.nih.gov/articles/4391560 - Alvarez, Ceballos & Quinteiro (2009), The role of inbreeding in the extinction of a European royal dynasty, PLoS ONE: https://doi.org/10.1371/journal.pone.0005174 - Jónsson et al. (2017), Parental influence on human germline de novo mutations in 1,548 trios from Iceland, Nature: https://pubmed.ncbi.nlm.nih.gov/28959963/ - Bennett et al. (2002), Genetic counseling and screening of consanguineous couples, J. Genetic Counseling (small-sample pooled estimate) - NZ Department of Conservation, Chatham Island black robin: https://www.doc.govt.nz/black-robin - Hoelzel et al. (2024), Genomics of post-bottleneck recovery in the northern elephant seal, Nature Ecology & Evolution - Norfolk Island heritage, Pitcairn settlement 1856: https://kingston.norfolkisland.gov.au/explore-the-layers-of-history/Pitcairn-settlement-1856-present - Hu et al. (2023), Genomic inference of a severe human bottleneck, Science (contested by some researchers) - Marin & Beluffi (2018), Computing the minimal crew for a multi-generational space journey: https://arxiv.org/abs/1806.03856 Our own arithmetic: ×5 per generation assumes ten children per couple and that every child survives. Paper Spark is also on Instagram, TikTok, Facebook and Threads: @papersparkstories

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