Fifty years since a simple equation described the chaos of biology

May, R. M. Nature 261 , 459–467 (1976). Article PubMed Google Scholar Stoppard, T. Arcadia (Faber & Faber, 1993). Google Scholar Thorne, K. S. & Blandford, R. D. Modern Classical Physic s (Princeton Univ. Press, 2017). Google Scholar May, R. M. in It Must Be Beautiful (ed. Farmelo, G.) 28–45 (Granta, 2003). Google Scholar Letellier, C. et al. Chaos 31 , 053110 (2021). Article PubMed Google Scholar Poincaré, H. Acta Mathematica 13 , 1–270 (1890). Google Scholar Cartwright, M. L. & Littlewood, J. E. J. Lond. Math. Soc. s 1-20 , 180–189 (1945). Article Google Scholar Mayer-Kress, G. & Haken, H. J . Stat. Phys. 26 , 149–171 (1981). Article Google Scholar Poon, C. S. & Barahona, M. Proc. Natl Acad. Sci. USA 98 , 7107–7112 (2001). Article PubMed Google Scholar Erguler, K. & Stumpf, M. P. H. Math. Biosci. 216 , 90–99 (2008). Article PubMed Google Scholar Nazish, M., Javid, M. & Banday, M. T. Cybersecurity 8 , 24 (2025). Article Google Scholar Gleick, J. Chaos: Making A New Science (Viking, 1987). Google Scholar May, R. M. Science 303 , 790–793 (2004). Article PubMed Google Scholar Haldane, A. G. & May, R. M. Nature 469 , 351–355 (2011). Article PubMed Google Scholar