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July 10 – Owen Chamberlain, American physicist, Nobel Prize laureate (died 2006). July 11 – David Challinor, American biologist, naturalist and scientific administrator at the Smithsonian Institution (died 2008). July 25 – Rosalind Franklin, English crystallographer (died 1958). July 30 – Marie Tharp, American geologist (died 2006).
The 1920s (pronounced "nineteen-twenties" often shortened to the "' 20s" or the "Twenties") was a decade that began on January 1, 1920, and ended on December 31, 1929. . Primarily known for the economic boom that occurred in the Western World following the end of World War I (1914–1918), the decade is frequently referred to as the "Roaring Twenties" or the "Jazz Age" in America and Western ...
Several scientific panels from this time period concluded that more research was needed to determine whether warming or cooling was likely, indicating that the trend in the scientific literature had not yet become a consensus. [46] [47] [48] John Sawyer published the study Man-made Carbon Dioxide and the "Greenhouse" Effect in 1972. [49]
A fly swatter is a hand-held device for swatting and killing flies and other insects. The first modern fly-destruction device was invented in 1900 by Robert R. Montgomery, an entrepreneur based in Decatur, Illinois. [75] On January 9, 1900, Montgomery was issued U.S. patent #640,790 for the "Fly-Killer". [76] 1900 Thumbtack
A Fierce Discontent: The Rise and Fall of the Progressive Movement in America, 1870–1920 (2003) Mowry, George. The Era of Theodore Roosevelt and the Birth of Modern America, 1900–1912. survey by leading scholar; Pease, Otis, ed. The Progressive Years: The Spirit and Achievement of American Reform (1962), primary documents
1920s: Finance. America's wealth more than doubled in the years between 1920 and '29. Most of this wealth funneled into finance and industry, but enough trickled down to low-level employees to let ...
1920 – First radio broadcasts, by KDKA in Pittsburgh and WWJ in Detroit; 1920 – Volstead Act; 1920 – Esch–Cummins Act; 1920 – Economy collapses. The Depression of 1920–21 begins. 1920 – National Football League is formed; 1920 – 1920 U.S. presidential election: Warren G. Harding elected president, and Calvin Coolidge vice president.
In the early decades of its history, the United States was relatively isolated from Europe and also rather poor. At this stage, America's scientific infrastructure was still quite primitive compared to the long-established societies, institutes, and universities in Europe. Eight of America's founding fathers were scientists of some repute.