Kala Wewa and Sri Lanka's irrigation tanks
c. 460 CENotable
King Dhatusena builds the Kala Wewa reservoir, linked by the gently sloping Jaya Ganga canal to the tanks of Anuradhapura. Networks of tanks and canals let Sri Lankan farmers grow rice through the dry season.
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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 → Kala Wewa and Sri Lanka's irrigation tanks
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