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Pages in category "20th-century inventions" The following 126 pages are in this category, out of 126 total. This list may not reflect recent changes. A.
From the first Apple computer to the COVID-19 vaccine, here are the most revolutionary inventions that were born in the U.S.A. in the past half-century.
The Lower Paleolithic period lasted over 3 million years, during which there many human-like species evolved including toward the end of this period, Homo sapiens.The original divergence between humans and chimpanzees occurred 13 (), however interbreeding continued until as recently as 4 Ma, with the first species clearly belonging to the human (and not chimpanzee) lineage being ...
The 20th century saw mathematics become a major profession. As in most areas of study, the explosion of knowledge in the scientific age has led to specialization: by the end of the century there were hundreds of specialized areas in mathematics and the Mathematics Subject Classification was dozens of pages long. [72]
Parclo (partial cloverleaf) interchange – developed by planners at the Ministry of Transportation of Ontario (c. 20th century) Quasiturbine – invented in 1996 [58] Road lines – invented by John D. Millar, an engineer for the Ontario Department of Transport.
20th Century Fox presents in New York on an 8 m × 4 m big screen the first widescreen movie. The radio station Witzleben begins in Germany with the regular broadcasting of television test broadcasts, initially on long wave with 30 lines (= 1,200 pixels) at 12.5 image changes per second. It appear first blueprints for television receiver.
Electrification spread rapidly in the 20th century. At the beginning of the century electric power was for the most part only available to wealthy people in a few major cities. By 2019, an estimated 87 percent of the world's population had access to electricity. [98] Birth control also became widespread during the 20th century.
Pages in category "20th-century American inventors" The following 200 pages are in this category, out of approximately 1,313 total. This list may not reflect recent changes .