World Wars and the AtomMedicine & Health 1918 influenza pandemic 1918Turning point The deadliest pandemic of the 20th century kills an estimated 50 million people. ▲ MattersSaveShareTrace roots Longest chain: The Big Bang → First stars ignite → Supernovae seed heavy elements → The Sun forms → Earth forms → First oceans → First life → Photosynthesis evolves → Great Oxidation Event → Complex cells (eukaryotes) → Multicellular life → First animals → Cambrian Explosion → First vertebrates → Jawed fish → Fish walk onto land → The amniotic egg → The Great Dying → Dinosaurs appear → Asteroid ends the dinosaurs → Early primates → Apes split from monkeys → Human line splits from chimpanzees → Walking upright → First stone tools → Genus Homo appears → Homo erectus → Control of fire → Habitual fire and cooking → Homo sapiens appears → Complex language → Natufian villages → Oldest known bread → Agriculture begins → Irrigation → Uruk and the first cities → Cylinder seals → Writing (cuneiform) → Babylonian mathematics → Babylonian astronomical diaries → Thales and natural philosophy → Trial and death of Socrates → Plato's Academy → Aristotle's Lyceum → Alexander's conquests → Alexandria founded → Library of Alexandria → House of Wisdom → Al-Khwarizmi and algebra → Fibonacci's Liber Abaci → Bills of exchange → Medici Bank → Double-entry bookkeeping → Muscovy Company → English East India Company → Seven Years' War → American Revolution → Declaration of Independence → French Revolution → Revolutions of 1848 → German unification → World War I → 1918 influenza pandemic Community notesLoading notes… Learn more ranked by votesDocumentarchive.cdc.gov1918 pandemic (H1N1 virus) (CDC archive) ↗Editor's pickDocumentwwwnc.cdc.gov1918 influenza: the mother of all pandemics (Emerging Infectious Diseases, CDC) ↗Editor's pickBookJohn M. BarryThe Great Influenza ↗Editor's pickVideoSearch on YouTube1918 flu pandemic documentary ↗Editor's pick