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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).
By 1920, 254,000 miles (408,800 km) of standard-gauge railroad track had been laid in the United States, all of it owned or controlled by seven organizations. [45] The need to synchronize train schedules and the inefficiencies introduced by every city having its own local time, also led to introduction of Standard time by railway managers in 1883.
1920 Jungle gym The jungle gym, also known as monkey bars or climbing frame, is a piece of playground equipment made of many pieces of thin material, such as metal pipe or, in more current playgrounds, rope, on which children can climb, hang, or sit.
Callendar presented evidence that both temperature and the CO 2 level in the atmosphere had been rising over the past half-century, and he argued that newer spectroscopic measurements showed that the gas was effective in absorbing infrared in the atmosphere. Nevertheless, most scientific opinion continued to dispute or ignore the theory. [36]
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.
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 ...
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 ...
At 12:01 a.m., Jan. 17, 1920, America was cut off. Saloons closed their doors. Taps stopped flowing. People stockpiled their whiskey, beer and wine to weather the dry spell that would last 13 years.