THE TWENTIES
A Chronology of Events
Editor: Piero Scaruffi

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    1920:
  • KDKA (Pittsburgh) is the first radio station
  • Women granted same voting rights as men in the US
  • French communist party founded
    1922:
  • Bertrand Russell publishes the "Principia Mathematica"
  • Howard Carter discovers the tomb of pharaph Tutankhamun
  • The Soviet Union experiments with a new economic policy, NEP
  • Ludwig Wittgenstein publishes the "Tractatus Logico-philosophicus"
  • Benito Mussolini becomes "duce" of Italy
    1923:
  • Hyperinflation in Germany: the mark goes down from 2000 DM for $1 to 4.2 trillion DM to $1 (in november the Rentenmark is introduced, worth 1 trillion paper marks, or about $0.24)
    1924:
  • Louis DeBroglie discovers that matter is both particles and waves
  • Hollerith's Tabulating Machine Company changes name to International Bussiness Machines (IBM)
  • Stalin becomes ruler of the Soviet Union
  • 441,000 cars registered in Los Angeles
    1925:
  • Cellophane is introduced
  • All men in Japan can vote at the national election
  • Edwin Hubble discovers the first galaxy outside the Milky Way (Andromeda), 2 million years away from the Earth
    1926:
  • Robert Goddard launches the first rocket (14 m. of altitude)
  • Invention of films with synchronized voice and music
  • United Airlines founded
    1927:
  • The Scotch tape is introduced
  • Werner Heisenberg discovers the uncertainty principle
  • Oil struck in Iraq
  • Philo Farnsworth invents the television in San Francisco
  • First talked movie
    1928:
  • Alexander Fleming identifies penicillin
  • Women granted same voting rights as men in Britain
  • First daily passenger flight between Los Angeles and San Francisco
    1929:
  • Stock crash and beginning of the Great Depression
  • Latex is invented
  • Edwin Hubble discovers that galaxies recede from one another: the universe is expanding in all directions

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