Science Year by Year 1920-1929

This is a list of major discoveries and inventions from the book Popular Science: Science Year by Year published by Scholastic. How many of these did you know happened in this time period?

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1

First Regular Broadcast on Radio (1920)

First Regular Broadcast on Radio (1920)

2

"Tommy" Gun Developed in U.S. (1920)

"Tommy" Gun Developed in U.S. (1920)

3

First Film With Sound (1920)

First Film With Sound (1920)

4

Insulin Extract Isolated (1921)

Insulin Extract Isolated (1921)

5

Pearls Cultured (1921)

Pearls Cultured (1921)

6

Used Inkblots as a Diagnostic Tool (1921)

Used Inkblots as a Diagnostic Tool (1921)

7

Sonar Used to Research Ocean (1922)

Sonar Used to Research Ocean (1922)

8

King Tut's Tomb Discovered (1922)

King Tut's Tomb Discovered (1922)

9

Plaskett Discovers Double Stars (1922)

Plaskett Discovers Double Stars (1922)

10

TB Vaccine Developed (1923)

TB Vaccine Developed (1923)

11

First Planetarium Introduced (1923)

First Planetarium Introduced (1923)

12

Zippers Introduced (1923)

Zippers Introduced (1923)

13

Self-Winding Watches (1924)

Self-Winding Watches (1924)

14

First Portable Radio (1924)

First Portable Radio (1924)

15

First Intercity Highway Opens (1924)

First Intercity Highway Opens (1924)

16

Celluwipes/Kleenex Introduced (1924)

Celluwipes/Kleenex Introduced (1924)

17

Urea-Formaldehyde Resin Used for Tableware (1924)

Urea-Formaldehyde Resin Used for Tableware (1924)

18

First Moving-Coil Loudspeaker (1924)

First Moving-Coil Loudspeaker (1924)

19

Farmall Tractor Introduced (1924)

Farmall Tractor Introduced (1924)

20

Lecia High Quality Camera Introduced (1925)

Lecia High Quality Camera Introduced (1925)

21

Australopithecus Africanus Human Ancestor Identified (1925)

Australopithecus Africanus Human Ancestor Identified (1925)

22

First TV Picture (1925)

First TV Picture (1925)

23

Importance of Iron in Red Blood Cells Discovered (1925)

Importance of Iron in Red Blood Cells Discovered (1925)

24

Pauli Develops "Exclusion Principle" (1925)

Pauli Develops "Exclusion Principle" (1925)

25

Waterskiing Becomes Popular (1925)

Waterskiing Becomes Popular (1925)

26

Snowblower Developed (1925)

Snowblower Developed (1925)

27

First Freeway Opens in NY (1925)

First Freeway Opens in NY (1925)

28

The Jazz Singer Shown in Movie Theaters (1926)

The Jazz Singer Shown in Movie Theaters (1926)

29

Toasters Equipped With Timers (1926)

Toasters Equipped With Timers (1926)

30

First Flight Over North Pole (1926)

First Flight Over North Pole (1926)

31

Aerosol Sprays Invented (1926)

Aerosol Sprays Invented (1926)

32

Tests for Measuring Intelligence Developed (1926)

Tests for Measuring Intelligence Developed (1926)

33

Ur's Royal Tomb Discovered (1926)

Ur's Royal Tomb Discovered (1926)

34

First Liquid-Fuel-Propelled Rocket (1926)

First Liquid-Fuel-Propelled Rocket (1926)

35

New Value for Speed of Light Introduced (1926)

New Value for Speed of Light Introduced (1926)

36

$Theory That Electrons Can Diffract Introduced (1927)$

Theory That Electrons Can Diffract Introduced (1927)

37

Heisenberg's "Uncertainty Principle" (1927)

Heisenberg's "Uncertainty Principle" (1927)

38

Introduction of First Tape Recorder (1927)

Introduction of First Tape Recorder (1927)

39

Cellophane/Scotch Tape Invented (1927)

Cellophane/Scotch Tape Invented (1927)

40

Holland Tunnel Opens (1927)

Holland Tunnel Opens (1927)

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