| |
Year |
Event(s) |
| 1 | 1921 | - Artificial life begins -- the first robot built.
- Calvin Coolidge president of the USA 1921-1929. Calvin Coolidge, vice president under Warren Harding, sworn in as president the day after Harding dies.
- John Larson, a University of California medical student, invented the modern lie detector (polygraph), used by police since 1924.
- Warren Harding president of the USA 1921. Warren Harding dies of an embolism in San Francisco. He had taken ill on 31 Jul 1921.
|
| 2 | 1922 | - Insulin invented by Sir Frederick Grant Banting.
- The first 3-D movie (spectacles with one red and one green lens) is released.
|
| 3 | 1923 | - Clarence Birdseye invents frozen food.
- Garrett A. Morgan invents a traffic signal.
- John Harwood invented the self-winding watch.
- The television or iconoscope (cathode-ray tube) invented by Vladimir Kosma Zworykin.
|
| 4 | 1924 | - Notebooks with spiral bindings invented.
- The dynamic loudspeaker invented by Rice and Kellogg.
|
| 5 | 1925 | - The mechanical television a precursor to the modern television, invented by John Logie Baird.
|
| 6 | 1926 | - Robert H. Goddard invents liquid-fueled rockets.
|
| 7 | 1927 | - Erik Rotheim patents an aerosol can.
- JWA Morrison invents the first quartz crystal watch.
- Philip Drinker invents the iron lung.
- Philo Taylor Farnsworth invents a complete electronic TV system.
- Technicolor invented.
- Warren Marrison developed the first quartz clock.
|
| 8 | 1928 | - Bubble gum invented by Walter E. Diemer.
- Jacob Schick patented the electric shaver.
- Scottish biologist Alexander Fleming discovers penicillin.
|
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