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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