Old Stone AgeTechnology Spear-thrower (atlatl) c. 20,000 BCENotable A lever that throws spears faster and farther, one of the first mechanical tools. ▲ 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 → Hand axes (Acheulean) → Wooden hunting spears → Spear-thrower (atlatl) Community notesLoading notes… Learn more ranked by votesBookRichard G. Klein and Blake EdgarThe Dawn of Human Culture ↗Editor's pickVideoSearch on YouTubeatlatl spear thrower history ↗Editor's pick