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Science Year by Year 1920-1929 - Page 2

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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How many did you know of?

Page 2 of 2
41
First Nonstop, Solo Flight Across Atlantic (1927)
First Nonstop, Solo Flight Across Atlantic (1927)
42
Rolex's Waterproof Wristwatch (1927)
Rolex's Waterproof Wristwatch (1927)
43
Spearheads Proved Existence of Native Americans as Far Back as Ice Age (1927)
Spearheads Proved Existence of Native Americans as Far Back as Ice Age (1927)
44
First "Iron Lung" (1927)
First "Iron Lung" (1927)
45
Zeppelin Completes Return Flight to U.S. (1928)
Zeppelin Completes Return Flight to U.S. (1928)
46
Bubble Gum Is Able to Be Blown Into Bubbles (1928)
Bubble Gum Is Able to Be Blown Into Bubbles (1928)
47
First Quartz Crystal Clock Developed (1928)
First Quartz Crystal Clock Developed (1928)
48
First Modern Electric Razor Invented (1928)
First Modern Electric Razor Invented (1928)
49
Fleming Discovers Penicillin (1928)
Fleming Discovers Penicillin (1928)
50
Elastoplast, Adhesive Plaster Invented (1928)
Elastoplast, Adhesive Plaster Invented (1928)
51
"Red Shift" Theory Introduced (1929)
"Red Shift" Theory Introduced (1929)
52
Yo-Yo Introduced (1929)
Yo-Yo Introduced (1929)
53
BBC Starts TV Broadcasts (1929)
BBC Starts TV Broadcasts (1929)
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